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QNT 275 Week 2 Homework Problem Set Excel File For more course tutorials visit www.tutorialrank.com 1. In a hearing test subjects estimate the loudness in decibels of a sound and the results are: 69 67 71 72 65 75 68 68 83 73 68. Calculate the measures of central tendency Mean median mode and the measures of dispersion range standard deviation variance. 2.

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The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time 2 p.m.. They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows in minutes. 117 123 110 117 99 120 148 118 119 120 45 130 118 What is the 72d percentile 3. The average life of Canadian women is 73.90 years and the standard deviation of the life expectancy of Canadian women is 9 years. Based on Chebyshevs Theorem determine the upper and lower bounds on the

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average life expectancy of Canadian women such that at least 95 percent of the population is included if the sample size is 100 women. 4. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time 2 p.m.. They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows in minutes: 118 121 114 116 110 120 145 118 119 121 45 135 118. Calculate the measures of central tendency Mean median mode and the measures of dispersion range standard deviation variance. 5.

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The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 8. An airplane arrived 12 minutes after the stated arrival time. Calculate the z-score for the lateness of this particular airplane. 6. According to a survey of the top 15 employers in a major city in the Midwest a worker spends an average of 400 minutes a day on the job. Suppose the standard deviation is 20 minutes and the time spent is approximately a normal distribution. What are the times within which approximately 99.73 percent of all workers will fall 7.

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Recently an advertising company called 200 people and asked them to identify the company that was in an ad running nationwide. The following results were obtained. What percentage of those surveyed could not correctly recall the company 8. A local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. What percentage of purchases were plasma televisions by customers with the smallest credit balances 9.

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The following is a partial relative frequency distribution of grades in an introductory statistics course. Find the relative frequency for the B grade. 10 A CFO is looking at what percentage of a companys resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph. What would be the class length used in creating a frequency histogram ..................................................................................................................... ......................................... QNT 275 Week 3 Homework Problem Set Excel File For more course tutorials visit www.tutorialrank.com 1.

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A survey is made in a neighborhood of 90 voters. 75 are Democrats and 15 are Republicans. Of the Democrats 30 are women while 7 of the Republicans are women. If one subject from the group is randomly selected find the probability the individual is a male Republican. 2. Container 1 has 8 items 3 of which are defective. Container 2 has 5 items 3 of which are defective. If one item is drawn from each container what is the probability that only one of the items is defective 3. A letter is drawn from the alphabet of 26 letters. What is the probability that the letter drawn is a vowel

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4. A family has two children. What is the probability that both are girls given that at least one is a girl 5. If n 29 and p .6 then the standard deviation of the binomial distribution is

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6. Consider a Poisson distribution with an average of 4 customers per minute at the local grocery store. If X the number of arrivals per minute find the probability of more than 6 customers arriving within a minute. 7. An important part of the customer service responsibilities of a cable company is the speed with which trouble in service can be repaired. Historically the data show that the likelihood is 0.70 that troubles in a residential service can be repaired on the same day. For the first four troubles reported on a given day what is the probability that all four will be repaired on the same day

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8. Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 29 minutes and a standard deviation of 6 minutes. Suppose that in an effort to provide better service to the public the director of the local office is permitted to provide discounts to those individuals whose waiting time exceeds a predetermined time. The director decides that 10 percent of the customers should receive this discount. What number of minutes do they need to wait to receive the discount 9. An apple juice producer buys all his apples from a conglomerate of apple growers in one northwestern state. The amount of juice obtained from each of these apples is approximately normally distributed with a mean of 2.38 ounces and a standard deviation of 0.1 ounce. What is the probability that a randomly selected apple will contain more than 2.40 ounces 10

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While conducting experiments a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 8.00 m. What is the probability that a randomly selected depth is between 2.25 m and 5.00 m ..................................................................................................................... ......................................... QNT 275 Week 4 Homework Problem Set Excel File For more course tutorials visit www.tutorialrank.com 1. A sample of 100 items has a population standard deviation of 5.9 and a mean of 32. Construct a 95 percent confidence interval for μ. 2.

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At the end of 1990 1991 and 1992 the average prices of a share of stock in a portfolio were 34.75 34.65 and 31.25 respectively. To investigate the average share price at the end of 1993 a random sample of 75 stocks was drawn and their closing prices on the last trading day of 1993 were observed with a mean of 33.78 and a standard deviation of 14.25. Estimate the average price of a share of stock in the portfolio at the end of 1993 with a 90 percent confidence interval. 3. A research study investigated differences between male and female students. Based on the study results we can assume the population mean and standard deviation for the GPA of male students are µ 3.3 and σ 0.3. Suppose a random sample of 1200 male students is selected and the GPA for each student is calculated. Find the interval that contains 90 percent of the sample means for male students. 4. A manufacturing company measures the weight of boxes before shipping them to the customers. If the box weights have a population mean of 80 lb and standard deviation of 6 lb respectively then based on

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a sample size of 100 boxes what is the probability that the average weight of the boxes will exceed 83 lb 5. A random sample of size 100 is taken from a population with mean 64 and standard deviation 5.2. Find Px bar 60. ..................................................................................................................... ......................................... QNT 275T Apply Week 1 Connect Exercise All Possible Question Answers For more course tutorials visit www.tutorialrank.com Week 1 Connect Exercise All Possible Question Answers QNT/275T

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College entrance exam scores such as SAT scores are an example of an________ variable. ______ is a necessary component of a runs plot. Jersey numbers of soccer players is an example of an______ variable. An identification of police officers by rank would represent an________ level of measurement. A ________ is a set of assumptions about how sample data are selected and about the population from which the sample data are selected. A persons telephone area code is an example of an______ variable. Which of the following is a quantitative varible

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Which of the following is not a supervised learning technique in predictive analytics Any characteristic of an element is called a _________ . ________ uses traditional or newer graphics to present visual summaries of business information. ______ is a necessary component of a runs plot. An _________ variable can have values that indicates into which of several categories of a population it belongs A _______ is a set of assumptions about how sample data are selected and about the population from which the sample data are selected. Examining all population measurements is called a _______ . _______ sampling is where we know the chance that each element will be included in the sample Which allows us to make statistical inferences about the sample population. Statistical ________ refers to using a sample of measurements and making generalizations about the important aspects of population. A yes or no question is ________ . The two types of quantitative variables are Which of the following is a categorical variable

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..................................................................................................................... ......................................... QNT 275T Apply Week 2 Connect Exercise All Possible Question Answers For more course tutorials visit www.tutorialrank.com 1 An interval that contains a specified percentage of the individual measurements is called an _______________ interval. 2 A CFO is looking at what percentage of a companys resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph.

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What would be the class length used in creating a frequency histogram 3 When grouping a large sample of measurements into classes the ______________ is a better tool than the ___________. 4 All of the following are measures of central tendency except the ____________.

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5 The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z- score for the lateness of this particular airplane. 6 If a population distribution is skewed to the right then given a random sample from that population one would expect that the ____________. 7 Local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results.

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What percentage of purchases were plasma televisions by customers with the smallest credit balances 8 Which of the following graphical tools is not used to study the shapes of distributions 9 A flaw possessed by a population or sample unit is ___________.

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10 A relative frequency curve having a long tail to the right is said to be ___________.

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Wk 2: Apply: Week 2 Connect Exercise All Possible Question Answers 1. A flaw possessed by a population or sample unit is ___________. 2. The average lateness for one of the top airline companies is 10 minutes. The variance of the lateness measure is calculated as 9. An airplane arrived 13 minutes after the stated arrival time. Calculate the z- score for the lateness of this particular airplane. 3. The following is a partial relative frequency distribution of grades in an introductory statistics course.

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Find the relative frequency for the B grade. 4. The average life of Canadian women is 73.75 years and the standard deviation of the life expectancy of Canadian women is 6.5 years. Based on Chebyshevs Theorem determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 90 percent of the population is included.

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5. The Rivertown city council is attempting to choose one of four sites A B C or D as the location for its new emergency facility. After the new emergency facility becomes available for service the current emergency facility will be shut down. The project manager has estimated the following response times in minutes from each of the proposed sites to the four areas that must be served by the emergency facility. The number of emergency runs from the current emergency facility to each of the four areas over the past year is as follows:

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6. Compute the weighted mean response time from the proposed locations and determine which proposed site should be selected for the new emergency facility. 7. Which of the following graphical tools is not used to study the shapes of distributions 8. A histogram that tails out toward smaller values is ___________.

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9. Which of the following is not a graphical tool for descriptive analytics dashboards 10. When grouping a large sample of measurements into classes the ______________ is a better tool than the ___________. 11. A very simple graph that can be used to summarize a quantitative data set is called an ___________. ..................................................................................................................... .........................................

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QNT 275T Apply Week 3 Connect Exercise All Possible Question Answers For more course tutorials visit www.tutorialrank.com Week 3 Quiz Consider a standard deck of 52 playing cards a randomly selected card from the deck and the following events: R red B black A ace N nine D diamond and C club. Are D and C mutually exclusive Yes mutually exclusive.

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If the mileage per gallon for a car is normally distributed 32 mpg has a z score of 1.2 and 24 mpg has a z score of −.4 what is the mean mpg of the distribution The life of a light bulb is exponentially distributed with a mean of 1000 hours. What is the probability that the bulb will last less than 800 hours A letter is drawn from the alphabet of 26 letters. What is the probability that the letter drawn is a vowel A survey is made in a neighborhood of 80 voters. 65 are Democrats and 15 are Republicans. Of the Democrats 35 are women while 5 of the

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Republicans are women. If one subject from the group is randomly selected find the probability the individual is a male Republican. Suppose that the waiting time for a license plate renewal at a local office of a state motor vehicle department has been found to be normally distributed with a mean of 30 minutes and a standard deviation of 8 minutes. Suppose that in an effort to provide better service to the public the director of the local office is permitted to provide discounts to those individuals whose waiting time exceeds a predetermined time. The director decides that 15 percent of the customers should receive this discount. What number of minutes do they need to wait to receive the discount Container 1 has 8 items 3 of which are defective. Container 2 has 5 items 2 of which are defective. If one item is drawn from each container what is the probability that only one of the items is defective

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If n 15 and p .4 then the standard deviation of the binomial distribution is Assume the number of trucks passing an intersection has a Poisson distribution with a mean of 5 trucks per minute. What is the probability of 0 or 1 trucks in one minute Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store. If X the number of arrivals per minute find the probability of more than 7 customers arriving within a minute.

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QNT 275 Week 3 Apply Assignment 1. Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store. If X the number of arrivals per minute find the probability of more than 7 customers arriving within a minute. .0216 .0081 .0108 .0118

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Explanation: P X ≥ 8 .0081 + .0027 + .0008 + .0002 .0118 2. Consider a standard deck of 52 playing cards a randomly selected card from the deck and the following events: R red B black A ace N nine D diamond and C club. Are D and C mutually exclusive Yes mutually exclusive. No not mutually exclusive.

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3. The probability that an appliance is currently being repaired is .5. If an apartment complex has 100 such appliances what is the probability that at least 60 are currently being repaired Use the normal approximation to the binomial. .5000 .0287 .6000 .9713 Explanation: z 59.5 − .5 100/√.5.5100 1.9 P z ≥ 1.9 1 − 0.9713 0.0287

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4. Consider a Poisson distribution with an average of 3 customers per minute at the local grocery store. If X the number of arrivals per minute find the expected value of X. 3 9 1.5 1.7 5. While conducting experiments a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 7.00 m. What is the probability that a randomly selected depth is between 2.25 m and 5.00 m

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.79 .45 .55 .50 Explanation: P 2.25 ≤ x ≤ 5 5 − 2.25/7.0 − 2.0 2.75/5 .55

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6. If the random variable x is normally distributed ______ percent of all possible observed values of x will be within three standard deviations of the mean. 68.26 95.44 99.73 100 None of the other choices is correct. 7. For a binomial process the probability of success is 40 percent and the number of trials is 5. Find the variance.

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5.0 1.2 2.0 1.1 Explanation: σ2x 5 .4 .6 1.2 8. Employees of a local university have been classified according to gender and job type.

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If an employee is selected at random what is the probability that the employee is a member of the hourly staff given that the employee is female 0.400 0.133 0.160

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0.053 0.533 Explanation: 9. For a binomial process the probability of success is 40 percent and the number of trials is 5. Find P X ≤ 1. rev: 01_31_2019_QC_CS-156253 .0870

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.2592 .0778 .3370 Explanation: PX ≤ 1 PX 0 + PX 1 .0778 + .2592 .337 10. Container 1 has 8 items 3 of which are defective. Container 2 has 5 items 2 of which are defective. If one item is drawn from each container what is the probability that only one of the items is defective

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0.2250 0.3000 0.0250 0.4000 0.1500 Explanation: ..................................................................................................................... ......................................... QNT 275T Apply Week 4 Connect Exercise All Possible Question Answers

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For more course tutorials visit www.tutorialrank.com QNT 275T Apply Week 4 Connect Exercise All Possible Question Answers 1 A sample of 100 items has a population standard deviation of 5.1 and a mean of 21.6. Construct a 95 percent confidence interval for μ. 2 Recently a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain many consumers refused to visit the restaurant for some time after the event. A survey was conducted three months after the food poisoning occurred with a sample of 319

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former customers contacted. Of the 319 contacted 29 indicated that they would not go back to the restaurant because of the potential for food poisoning. Construct a 95 percent confidence interval for the true proportion of the market who still refuse to visit any of the restaurants in the chain three months after the event. 3 A research study investigated differences between male and female students. Based on the study results we can assume the population mean and standard deviation for the GPA of male students are µ 3.5 and σ 0.5. Suppose a random sample of 100 male students is selected and the GPA for each student is calculated. Find the interval that contains 95.44 percent of the sample means for male students.

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4 f the sampled population is finite and at least _____ times larger than the sample size we treat the population as infinite. 20 5 For the following hypothesis test where H0: μ ≤ 10 vs. HA: μ 10 we reject H0 at level of significance α and conclude that the true mean is greater than 10 when the true mean is really 8. Based on this information we can state that we have

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6 The ______________ of a sample statistic is the probability distribution of the population of all possible values of the sample statistic. 7 The t distribution approaches the _______________ distribution as the sample size ___________. 8 If the sampled population has a mean of 48 and standard deviation of 16 then the mean and the standard deviation for the sampling distribution of x¯x¯ for n 16 are

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9 The value of χ2α in a particular situation depends on 10 Assuming that the null hypothesis is true the ______________ is the probability of observing a value of the test statistic that is at least as extreme as the value actually computed from the sample data. 11 The width of a confidence interval will be

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12 A sample of 100 items has a population standard deviation of 51 and a mean of 216 construct a 95 percent confidence interval for M. 13 Recently a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain many consumers refused to visit the restaurant for some time after the event. A survey was conducted three months after the food poisioning occurred with a sample of 319 former customers contacted. Of the 319 contacted 29 indicated that they would not go back to the restaurant because of the potential for food poisioning. Construct a 95 percent confidence interval for the true propotion of the market who still refuse to visit any of the restaurants in the chain three months after the event.

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14 A manufacturing company measures the weight of boxes before shopping them to the customers. If the box weights have a population mean and standard deviation of 90 Ib and 24 Ib respectively then based on a sample size of 36 boxes. What is the probability that the average weight of the boxes will exceed 94 Ib 15 The number of defectives in 10 different samples of 100 observations each is the following: 1210231421. What is the estimate of the population proportion of defectives

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15 A research study investigated differences between male and female students. Based on the study results we can assume the population mean and standard deviation for the GPA of male students are µ3.5 and σ0.05 Suppose a random sample of 100 male students is selected and the GPA for each student is calculated. What is the probability that the random sample of 100 male students has means GPA greater than 3.42 16 A researcher for a paint company is measuring the level of a certain chemical contained in a particular type of paint. If the paint contains too much of this chemical the quality of the paint will be compromised. On average each can of paint contains 10 percent of the chemical. How many cans of paint should the sample contain if the researcher wants to be 98 percent certain of being within 1 percent of the true proportion of this chemical

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17 A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find px5t.5 18 Using the critical value rule if a two-sided null hypothesis is rejected for a single mean at a given significance level the corresponding one-sided null hypothesis i.e.the same sample size the same standard deviation and the same meanswill _______ be rejected at the same significance level.

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19 If the sampled population has a mean of 48 and standard deviation of 16 then the mean and the standard deviation for the sampling distribution of x for n16 are ..................................................................................................................... ......................................... QNT 275T Apply Week 5 Connect Exercise All Possible Question Answers For more course tutorials visit www.tutorialrank.com QNT 275T Apply Week 5 Connect Exercise All Possible Question Answers

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1 When the assumption of __________ residuals error terms is violated the Durbin-Watson statistic is used to test to determine if there is significant _____________ among the residuals. 2 In a simple linear regression analysis the correlation coefficient r and the slope b ___________ have the same sign. Always

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3 XYZ Company Annual Data 4 The simple linear regression least squares method minimizes 5 When using simple exponential smoothing the value of the smoothing constant α cannot be negative or

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6 If the Durbin-Watson statistic is greater than 4 − dL then we conclude that 7 In a simple regression analysis for a given data set if the null hypothesis β 0 is rejected then the null hypothesis ρ 0 is also rejected. This statement is ___________ true.

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8 The demand for a product for the last six years has been 15 15 17 18 20 and 19. The manager wants to predict the demand for this time series using the following simple linear trend equation: trt 12 + 2t. What are the forecast errors for the 5th and 6th years 9 In performing a chi-square goodness-of-fit test for a normal distribution a researcher wants to make sure that all of the expected cell

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frequencies are at least five. The sample is divided into 7 intervals. The second through the sixth intervals all have expected cell frequencies of at least five. The first and the last intervals have expected cell frequencies of 1.5 each. After adjusting the number of intervals the degrees of freedom for the chi-square statistic is ____. 10 The chi-square goodness-of-fit test for multinomial probabilities with 5 categories has _____ degrees of freedom. 11 When we carry out a chi-square test of independence the alternate hypothesis states that the two relevant classifications

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12 In a simple regression analysis for a given data set if the null hypothesis β0 is rejected then the null hypothesis p0 is also rejected. This statement is ______ true. 13 The strength of the relationship between two quantitative variables can be measured by 14 A real estates company is analyzing the selling prices of residential homes in a given community 140 homes that have been said

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in the past month are randomly selected and their selling prices are recorded. The statistician working on the project has started that in order to perform various stastical tests the data must be distributed according to a normal distribution. In order to determine whether the selling prices of homes included in the random sample are normally distributed the statistician divides the data into 6 classes of equal size and records the number of observations in each class. She then performs a chi-square goodness-of-fit test for normal distribution. The results are summarized in the following tables. What is the appropriate null hypothesis 15 XYZ company Annual data Actual demand Forecasted demand

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15 14 15 16 17 18 18 20 20 22 21 24 Based on the information given in the table abovewe can conclude that in general

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16 The chi-square goodness-of-fit test multinomial probabilities with 5 categories has ___ degress of freedom. 17 In a simple linear regression analysis the correlation coefficient and slope _____ have the same sign.

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18 When a binomial distribution describes count data that can be classified into one of two mutually exclusive categories a ____ distribution describes count data that are classified into more than two mutually exclusive categories. 19 Suppose that the unadjusted seasonal factor for the month of April is 100. The sum of the 12 months unadjusted seasonal factor values is 12.18. The normalizedadjusted seasonal factor value for April ..................................................................................................................... ......................................... QNT 275T Entire Course For more course tutorials visit www.tutorialrank.com

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QNT 275T Week 1 Discussion Statistics Tools QNT 275T Week 1 Practice Knowledge Check QNT 275T Apply Week 1 Connect Exercise QNT 275T Week 2 Discussion Charts QNT 275T Apply Week 2 Connect Exercise QNT 275T Week 2 Practice Knowledge Check QNT 275T Week 3 Discussion Sales Training QNT 275T Apply Week 3 Connect Exercise

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QNT 275T Week 3 Practice Knowledge Check QNT 275T Week 4 Discussion Income and Insurance QNT 275T Week 4 Practice Knowledge Check QNT 275T Apply Week 4 Connect Exercise QNT 275T Week 5 Discussion The Tasty Sub Shop Case and The QHIC Case QNT 275T Apply Week 5 Connect Exercise QNT 275T Week 5 Practice Knowledge Check

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QNT 275 Week 2 Homework Problem Set Excel File QNT 275 Week 3 Homework Problem Set Excel File QNT 275 Week 4 Homework Problem Set Excel File ..................................................................................................................... ......................................... QNT 275T Week 1 Discussion Statistics Tools For more course tutorials visit www.tutorialrank.com QNT 275T Week 1 Discussion Statistics Tools Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday

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1 A sequence of operations that takes inputs and turns them into outputs is a ________. 2 Time series data are data collected at the same time period.

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3 Cross-sectional data are data collected at the same point in time. 4 The number of sick days taken by employees in 2008 for the top 10 technology companies is an example of time series data. 5 Any characteristic of an element is called a ______.

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6 ______ uses traditional or newer graphics to present visual summaries of business information. 7 Daily temperature in a local community collected over a 30-day time period is an example of cross-sectional data.

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8 Secondary data are data taken from an existing source. ..................................................................................................................... ......................................... QNT 275T Week 2 Discussion Charts For more course tutorials visit www.tutorialrank.com QNT 275T Week 2 Discussion Charts Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words: Review the Discussion FAQs Module. Research the internet for an example of a pie chart or bar chart. Post a copy along with its source.

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Include a question regarding the chart for your classmates to respond to. Respond to a classmate’s question Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ..................................................................................................................... ......................................... QNT 275T Week 2 Practice Knowledge Check All Possible Question Answers For more course tutorials visit www.tutorialrank.com Wk 2: Practice: Week 2 Knowledge Check All Possible Question Answers 1. In a statistics class the following 10 scores were randomly selected: 74 73 77 77 71 68 65 77 67 66. What is the median

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77.0 73.0 72.0 71.0 71.5 To calculate median put data measurements in ascending order. The median for an even number of measurements is the average of the middle two measurements 71+73/2 2. The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. She took a random sample of the price of 10 computers with the following results.

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3250 1127 2995 3250 3445 3449 1482 6120 3009 4000 What is the IQR 3. Which of the following is not a graphical tool for descriptive analytics dashboards 4. All of the following are measures of central tendency except the ____________.

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5. The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set. False 6. In a hearing test subjects estimate the loudness in decibels of a sound and the results are: 68 67 70 71 68 75 68 62 80 73 68. What is the mean 7. A quantity that measures the variation of a population or a sample relative to its mean is called the ____________.

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variance coefficient of variation range standard deviation interquartile range 8. The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time 2 p.m.. They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows in minutes: 118 124 108 116 99 120 148 118 119 121 45 130 118. What is the mode 118

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114.15 148 45 115.5 Mode is the values that appears most frequently mode 118 occurs three times.

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1 The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time 2 p.m.. They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stopwatch to record the time they spent in line. The times recorded were as follows in minutes. 118 124 108 116 99 120 148 118 119 121 45 130 118 What is the IQR 28 2 The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time 2 p.m.. They selected 13 patrons and had them get in line between 2 and 3 p.m.

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Each was given a stopwatch to record the time they spent in line. The times recorded were as follows in minutes: 118 124 108 116 99 120 148 118 119 121 45 130 118. What is the median 118 3 Quality control is an important issue at ACME Company which manufactures light bulbs. Totest the life-hours of their light bulbs they randomly sampled nine light bulbs and measured how many hours they lasted: 378 361 350 375 200 391 375 368 321. What is the mode 375

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4 In a hearing test subjects estimate the loudness in decibels of a sound and the results are: 68 67 70 71 68 75 68 62 80 73 68. What is the mean 5 Quality control is an important issue at ACME Company which manufactures light bulbs. To test the life-hours of their light bulbs they randomly sampled nine light bulbs and measured how many hours they lasted: 378 361 350 375 200 391 375 368 321. What is the median

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6 When establishing the classes for a frequency table it is generally agreed that the more classes you use the better your frequency table will be. 7 Quality control is an important issue at ACME Company which manufactures light bulbs. To test the life-hours of their light bulbs they randomly sampled nine light bulbs and measured how many hours they lasted: 378 361 350 375 200 391 375 368 321. What is the mean

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8 Which percentile describes the first quartile Q1 9 Quality control is an important issue at ACME Company which manufactures light bulbs. To test the life-hours of their light bulbs they randomly sampled nine light bulbs and measured how many hours they lasted mean 346.6. 378 361 350 375 200 391 375 368 321 What is the range

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10 Personnel managers usually want to know where a job applicant ranked in his or her graduating class. With a grade point average of 3.83 Michelle Robinson graduated above the 93rd percentile of her graduating class. What is the percentile rank of a student whose GPA was the median GPA. 11 In the least squares line ___________ is defined as rise/run. ..................................................................................................................... ......................................... QNT 275T Week 3 Discussion Sales Training For more course tutorials visit www.tutorialrank.com QNT 275T Week 3 Discussion Sales Training Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students.

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Due Thursday Respond to the following in a minimum of 175 words: A company employs 400 salespeople. Of these 83 received a bonus last year 100 attended a special sales training program at the beginning of last year and 42 both attended the special sales training program and received a bonus. Note: the bonus was based totally on sales performance. a What proportion of the 400 salespeople received a bonus last year b What proportion of the 400 salespeople attended the special sales training program at the beginning of last year c What proportion of the 400 salespeople both attended the special sales training program and received a bonus d What proportion of the salespeople who attended the special sales training program received a bonus

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e Based on your answers to parts a and d does the special sales training program seem to have been effective Explain your answer. Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ..................................................................................................................... ......................................... QNT 275T Week 3 Practice Knowledge Check All Possible Question Answers For more course tutorials visit www.tutorialrank.com Week 3 Knowledge Check All Possible Question Answers

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In a local survey 100 citizens indicated their opinions on a revision to a local land-use plan. Of the 62 persons giving favorable responses 40 were males. Of the 38 giving unfavorable responses 15 were males. If one citizen is randomly selected find the probability that person is male and has a favorable opinion. The set of all possible outcomes for an experiment is called an ____________. Probabilities must be assigned to each sample space outcome so that the probabilities of all the sample space outcomes add up to _____________.

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New car owners were asked to evaluate their experiences in buying a new car during the past 12 months. In the survey the owners indicated they were most satisfied with their experiences at the following three dealers in no particular order: Subaru Honda and Buick. Assuming that each set of rankings is equally likely what is the probability that owners ranked Subaru third The internal auditor for your company believes that 10 percent of your invoices contain errors. To Check All Possible Question Answers this theory 20 invoices are randomly selected and 5 are found to have errors. What is the probability that of the 20 invoices selected 5 or more would contain errors if the theory is valid The standard deviation of a standard normal distribution is always equal to 1.

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If A and B are independent events PA .2 and PB .7 determine A fair die is rolled 10 times. What is the average number of even number outcomes

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1. In a statistical study the random variable X 1 if the house is colonial and X 0 if the house is not colonial. The random variable X is continuous. 2. The expected value of the discrete random variable x is the population mean. 3. If the random variable x is normally distributed ______ percent of all possible observed values of x will be within three standard deviations of the mean.

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4. Given that X is a normal random variable the probability that a given value of X is below its mean is ________________. 5. Consider a standard deck of 52 playing cards a randomly selected card from the deck and the following events: R red B black A ace N nine D diamond and C club. Are R and C mutually exclusive 6. Consider a standard deck of 52 playing cards a randomly selected card from the deck and the following events: R red B black A ace N nine D diamond and C club. Are D and C mutually exclusive 7. Which of the following statements about the binomial distribution is not correct

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8. If the random variable x is normally distributed 68.26 percent of all possible observed values of x will be within two standard deviations of the mean. 9. An important part of the customer service responsibilities of a cable company is the speed with which trouble in service can be repaired. Historically the data show that the likelihood is 0.75 that troubles in a residential service can be repaired on the same day. For the first five troubles reported on a given day what is the probability that all five will be repaired on the same day 10. Consider a standard deck of 52 playing cards a randomly selected card from the deck and the following events: R red B black A ace N nine D diamond and C club. .

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11. If the random variable of x is normally distributed _____ percent of all possible observed values of x will be within two standard deviations of the mean. 12. In a local survey 100 citizens indicated their opinions on a revision to a local land-use plan. Of the 62 persons giving favorable responses 40 were males. Of the 38 giving unfavorable responses 15 were males. If one citizen is randomly selected find the probability that person is male and has a favorable opinion. 13. Suppose that you believe that the probability you will get a grade of B or better in Introduction to Finance is .6 and the probability that you will get a grade of B or better in Introduction to Accounting is .5. If these events are independent what is the probability that you will receive a grade of B or better in both courses

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14. The time in seconds it takes for an athlete to run 50 meters is an example of a continuous random variable. 15. In a binomial distribution the random variable X is continuous. 16. At an oceanside nuclear power plant seawater is used as part of the cooling system. This raises the temperature of the water that is discharged back into the ocean. The amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° C. What is the standard deviation of the temperature increase

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17. A continuous probability distribution having a rectangular shape where the probability is evenly distributed over an interval of numbers is an ____________ distribution. 18. The z value tells us the number of standard deviations that a value x is from the mean. 19. A fair die is rolled 10 times. What is the average number of even number outcomes 20. A random variable is a numerical value that is determined by the outcome of an experiment. 21. A continuous random variable may assume only integer values in a given interval.

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22. A survey is made in a neighborhood of 80 voters. 65 are Democrats and 15 are Republicans. Of the Democrats 35 are women while 5 of the Republicans are women. If one subject from the group is randomly selected find the probability the individual is a Democrat or a Republican. QNT 275T Week 4 Discussion Income and Insurance http://www.tutorialrank.com/QNT/QNT-275T/product-27879- QNT-275T-Week-4-Discussion-Income-and-Insurance For more course tutorials visit www.tutorialrank.com QNT 275T Week 4 Discussion Income and Insurance Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday

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Respond to the following in a minimum of 175 words: Suppose that we wish to assess whether more than 60 percent of all U.S. households in a particular income class bought life insurance last year. That is we wish to assess whether p the proportion of all U.S. households in the income class that bought life insurance last year exceeds .60. Assume that an insurance survey is based on 1000 randomly selected U.S. households in the income class and that 640 of these households bought life insurance last year. a Assuming that p equals .60 and the sample size is 1000 what is the probability of observing a sample proportion that is at least .64 b Based on your answer in part a do you think more than 60 percent of all U.S. households in the income class bought life insurance last year Explain. Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ..................................................................................................................... .........................................

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QNT 275T Week 4 Practice Knowledge Check All Possible Question Answers For more course tutorials visit www.tutorialrank.com Week 4 Knowledge Check All Possible Question Answers If we have a sample size of 100 and the estimate of the population proportion is .10 we can estimate the sampling distribution of pˆp with a normal distribution. The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true.

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As the sample size increases the standard deviation of the sampling distribution increases. A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1500 voting age citizens. 1020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. What is the alternative hypothesis

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If the sampled population distribution is skewed then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30. A research study investigated differences between male and female students. Based on the study results we can assume the population mean and standard deviation for the GPA of male students are µ 3.5 and σ 0.5. Suppose a random sample of 100 male students is selected and the GPA for each student is calculated. What is μx¯μx¯ It has been reported that the average time to download the home page from a government website was 0.9 seconds. Suppose that the download times were normally distributed with a standard deviation of 0.3

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seconds. If random samples of 23 download times are selected describe the shape of the sampling distribution and how it was determined. In the upcoming election for governor the most recent poll based on 900 respondents predicts that the incumbent will be reelected with 55 percent of the votes. From the 900 respondents how many indicated that they would not vote for the current governor or indicated that they were undecided 1 Based on a random sample of 25 units of product X the average weight is 102 lb and the sample standard deviation is 10 lb. We would like to decide if there is enough evidence to establish that the average weight for the population of product X is greater than 100 lb. Therefore

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the alternative hypothesis can be written as HA: μ 100. Assume the population is normally distributed. True 2 The power of a statistical test is the probability of rejecting the null hypothesis when it is false. True 3 A research study investigated differences between male and female students. Based on the study results we can assume the population mean and standard deviation for the GPA of male students are µ 3.5 and σ 0.5. Suppose a random sample of 100 male students

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is selected and the GPA for each student is calculated. What is μx ⎯⎯μx¯ 3.5 4 The t distribution always has n degrees of freedom. False 5 A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1500 voting age citizens. 1020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens

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supporting an increase in cigarette taxes is significantly greater than .66. Identify the null hypothesis. 6 In the upcoming election for governor the most recent poll based on 900 respondents predicts that the incumbent will be reelected with 55 percent of the votes. From the 900 respondents how many indicated that they would not vote for the current governor or indicated that they were undecided 7 If p .8 and n 50 then we can conclude that the sampling distribution of pˆp is approximately a normal distribution.

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8 A recent study conducted by the state government attempts to determine whether the voting public supports a further increase in cigarette taxes. The opinion poll recently sampled 1500 voting age citizens. 1020 of the sampled citizens were in favor of an increase in cigarette taxes. The state government would like to decide if there is enough evidence to establish whether the proportion of citizens supporting an increase in cigarette taxes is significantly greater than .66. What is the alternative hypothesis p

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9 According to the Central Limit Theorem if a sample size is at least _____ then for most sampled populations we can conclude that the sample means are approximately normal. 10 The null hypothesis is a statement that will be accepted only if there is convincing sample evidence that it is true.

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11 The sampling distribution of a sample statistic is the probability distribution of the population of all possible values of the sample statistic. 12 If the sampled population distribution is skewed then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30. 13 If we have a sample size of 100 and the estimate of the population proportion is .10 we can estimate the sampling distribution of pˆp with a normal distribution.

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14 For a given hypothesis test if we do not reject H0 and H0 is true 15 As the sample size increases the standard deviation of the sampling distribution increases.

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16 It has been reported that the average time to download the home page from a government website was 0.9 seconds. Suppose that the download times were normally distributed with a standard deviation of 0.3 seconds. If random samples of 23 download times are selected describe the shape of the sampling distribution and how it was determined. 17 An _____________ hypothesis is the statement that is being tested. It usually represents the status quo and it is not rejected unless there is convincing sample evidence that it is false. ..................................................................................................................... ......................................... QNT 275T Week 5 Discussion The Tasty Sub Shop Case and The QHIC Case

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For more course tutorials visit www.tutorialrank.com QNT 275T Week 5 Discussion The Tasty Sub Shop Case and The QHIC Case Post a total of 3 substantive responses over 2 separate days for full participation. This includes your initial post and 2 replies to other students. Due Thursday Respond to the following in a minimum of 175 words: The Tasty Sub Shop Case: A business entrepreneur uses simple linear regression analysis to predict the yearly revenue for a potential restaurant site on the basis of the number of residents living near the site. The entrepreneur then uses the prediction to assess the profitability of the potential restaurant site. And

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The QHIC Case: The marketing department at Quality Home Improvement Center QHIC uses simple linear regression analysis to predict home upkeep expenditure on the basis of home value. Predictions of home upkeep expenditures are used to help determine which homes should be sent advertising brochures promoting QHIC’s products and services. Discuss the difference in the type of prediction in both cases and provide rational of the reasons that these predictions were used. Due Monday Reply to at least two of your classmates. Be constructive and professional in your responses. ..................................................................................................................... ......................................... QNT 275T Week 5 Practice Knowledge Check All Possible Question Answers For more course tutorials visit www.tutorialrank.com

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1 In simple regression analysis the quantity that gives the amount by which Ydependent variable changes for a unit change in Xindependent variable is called the 2 The chi-square goodness-of-fit test will be valid if the average of the expected cell frequencies is 3 In simple linear regression analysis we assume that the variance of the independent variable X is equal to the variance of the dependent variable Y.

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4 The upward or downward movement that characterizes a time series over a period of time is referred to as _____________. 5 A major drawback of the aggregate price index is that

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It does not take into account the fact that some items in the market based are purchased more frequently than others 6 The chi-square goodness-of-fit is _________ a one-tailed test with the rejection region in the right tail 7 The number of degrees of freedom associated with a chi-square test for independence based upon a contingency table with 4 rows and 3 columns is _____. 6

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8 Suppose that the unadjusted seasonal factor for the month of April is 1.10. The sum of the 12 months unadjusted seasonal factor values is 12.18. The normalized adjusted seasonal factor value for April 9 A sequence of values of some variable or composite of variables taken at successive uninterrupted time periods is called a 10 Those fluctuations that are associated with climate holidays and related activities are referred to as __________ variations.

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11 When the moving average method is used to estimate the seasonal factors with quarterly sales data a ______ period moving average is used. 12 The range for r2 is between 0 and 1 and the range for r is between ____________.

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13 The strength of the relationship between two quantitative variables can be measured by 14 The correlation coefficient may assume any value between 15 The slope of the simple linear regression equation represents the average change in the value of the dependent variable per unit change in the independent variable X.

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16 One use of the chi-square goodness-of-fit test is to determine if specified multinomial probabilities in the null hypothesis are correct. 17 In simple linear regression analysis we assume that the variance of the independent variable X is equal to the variance of the dependent variable Y.

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18 The correlation coefficient is the ratio of explained variation to total variation 19 A ______________________ measures the strength of the relationship between a dependent variable Y and an independent variable X.

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20 A multinomial probability distribution describes data that are classified into two or more categories when a multinomial experiment is carried out. 21 The ____________________ is the proportion of the total variation in the dependent variable explained by the regression model. 22 When we carry out a chi-square test of independence the chi- square statistic is based on r × c − 1 degrees of freedom where r and

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cdenote respectively the number of rows and columns in the contingency table. 23 An experiment consists of 400 observations and four mutually exclusive groups. If the probability of a randomly selected item being classified into any of the four groups is equal then the expected number of items that will be classified into group 1 is _____. 24 A major drawback of the aggregate price index is that

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It does not take into account the fact that some items in the market basket are purchased more frequently than others 25 In simple regression analysis the quantity that gives the amount by which ydependent variable changes for a unit change in xindependent variable is called the 26 In simple linear regression analysis we assume that the variance of the independent variable X is equal to the variance of the dependent variableY.

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27 When the moving average method is used to estimate the seasonal factors with quarterly sales data a _____ period moving average is used. 28 Those fluctuations that are associated that are associated with climate holidays and related activities are referred to as _______ variations.

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29 A sequences of values of some variable or composite of variables taken at successive uninterrupted time periods is called a 