Review of some concepts from Chapters 4 through 6
Probability
Discrete Distributions
Normal Distribution Statistics Review

Slide 2:

Proceed to the next slide, by clicking the button below, to start the first question.
You will answer a series of questions. Click on the answer you believe to be correct.
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Enjoy! Instructions

Question 1 :

Question 1 For a normal distribution, the spread of the curve decreases and its height increases as:
A. The ratio of the mean and standard deviation increases
B. The sample size decreases
C. The mean increases
D. The standard deviation decreases

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Sorry… You chose the wrong answer!
Please return to the previous slide and click the hyperlinked question to try to find the correct answer. When finished searching the website, try again!

That is Correct!!! :

That is Correct!!! Nice work. You sure know your stuff!
For a normal distribution, the spread of the curve decreases and its height increases as the standard deviation decreases.
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Keep up the good work!

Question 2 :

Question 2 For a continuous random variable x, the total area under the probability distribution curve is always:
A. Equal to 1
B. Greater than 1
C. In the range zero to 1
D. Less than 1

Ooooopsey… :

Ooooopsey… You better think harder!
Please return to the previous slide and click the hyperlinked question to try to find the correct answer. When finished searching the website, try again!

That is Correct!!! :

That is Correct!!! You are super duper!
For a continuous random variable x, the total area under the probability distribution curve is always equal to 1.
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Keep up the good work!

Question 3 :

Question 3 According to a survey, 70% of adults believe that all college students should be required to perform community service to graduate. Assume that this percentage is true for the current population of all adults. Let x be the number of adults in a random sample of 12 who believe that all college students should be required to perform community service to graduate. What is the mean of x?
A. 4.80
B. 8.40
C. 7.20
D. 3.50

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Yowsers! You chose the wrong answer!
Please return to the previous slide and click the hyperlinked question to try to find the correct answer. When finished searching the website, try again!

That is Correct!!! :

That is Correct!!! You are super duper!
This is a binomial distribution since you have two outcomes. The mean of a binomial distribution is given by multiply the same size, n, by the probability of success, p.
Thus, we have n*p = 12(.70) = 8.4
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You are doing an awesome job!

Question 4 :

Question 4 Two households are randomly selected and it is observed whether or not each of them owns a telephone answering machine. The total number of outcomes for this experiment is:
A. six
B. eight
C. two
D. four

Uh oh! :

Uh oh! No way! You better think harder!
Please return to the previous slide and click the hyperlinked question to try to find the correct answer. When finished searching the website, try again!

That is Correct!!! :

That is Correct!!! You are awesome!
The total number of outcomes for this experiment is 4. You are selecting 2 people and each have 2 outcomes (yes or no), therefore by the counting rule,
2 * 2 = 4 outcomes.
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Way to go!

Question 5 :

Question 5 An ice cream shop offers 20 flavors of ice cream. How many ways are there to select 2 different flavors from these 20 flavors?
A. 50
B. 190
C. 625
D. 300

Nope! :

Nope! Better luck next time.
Please return to the previous slide and click the hyperlinked question to try to find the correct answer. When finished searching the website, try again!

That is Correct!!! :

That is Correct!!! Very nice!
The total number of combinations is found from nCr = 20C2 = 20!/(18! * 2!) = 20 * 19/ 2* 1 = 190.
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Great Work! r

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