logging in or signing up Margin of Error headlessprofessor Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1084 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: October 27, 2008 This Presentation is Public Favorites: 0 Presentation Description How to calculate margin of error and confidence interval estimates. Comments Posting comment... Premium member Presentation Transcript Margin of Error : Margin of Error & Confidence Intervals headlessprofessor When this applies : When this applies A sample is being used to estimate a population mean What it tells you : What it tells you How far off your estimate is likely to be What you need : What you need Sample size = N What you need : What you need Sample size = N Sample mean What you need : What you need Sample mean & N Standard deviation What you need : What you need Sample mean & N Standard deviation Z score for level of confidence What you need : What you need Sample mean & N Standard deviation Z score for level of confidence (z = 1.96) How to Calculate : How to Calculate Standard Deviation Divided by Square Root Of Sample Size How to Calculate : How to Calculate Standard Deviation Divided by Square Root Of Sample Size (standard error) How to Calculate : How to Calculate Margin of Error = Standard Error times Z score Example : Example N = 49 Mean = 78 Std Dev = 5 Z score = 1.96 How to Calculate : How to Calculate Square root of sample size = Square root of 49 = 7 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 Standard Error How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 Standard Error How to Calculate : How to Calculate Margin of Error = Std Error X Z 0.714 X 1.96 How to Calculate : How to Calculate Margin of Error = Std Error X Z 0.714 X 1.96 = 1.40 What this means : What this means Margin of Error: 95% of the time, the population mean will be within 1.40 of the mean Confidence Interval : Confidence Interval The range of scores from mean – ME to mean + ME Example of Confidence Interval : Example of Confidence Interval The range of scores from 78 – 1.40 to 78 + 1.40 Example of Confidence Interval : Example of Confidence Interval The range of scores from – 1.40 to 78 + 1.40 76.6 to 79.4 To get narrower : To get narrower Have a lower standard deviation To get narrower : To get narrower Have a lower standard deviation Accept a lower level of confidence (e.g., .90 instead of .95) To get narrower : To get narrower Have a lower standard deviation Accept a lower level of confidence (e.g., .90 instead of .95) Use a larger sample size N To get a better level of confidence : To get a better level of confidence Have a lower standard deviation To get a better level of confidence : To get a better level of confidence Have a lower standard deviation Accept a broader confidence interval To get a better level of confidence : To get a better level of confidence Have a lower standard deviation Accept a broader confidence interval Use a larger sample size Use T instead of Z : Use T instead of Z When population SD is not known Use T instead of Z : Use T instead of Z When population SD is not known Use df = N - 1 Margin of Error : Margin of Error & Confidence Intervals headlessprofessor You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Margin of Error headlessprofessor Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 1084 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: October 27, 2008 This Presentation is Public Favorites: 0 Presentation Description How to calculate margin of error and confidence interval estimates. Comments Posting comment... Premium member Presentation Transcript Margin of Error : Margin of Error & Confidence Intervals headlessprofessor When this applies : When this applies A sample is being used to estimate a population mean What it tells you : What it tells you How far off your estimate is likely to be What you need : What you need Sample size = N What you need : What you need Sample size = N Sample mean What you need : What you need Sample mean & N Standard deviation What you need : What you need Sample mean & N Standard deviation Z score for level of confidence What you need : What you need Sample mean & N Standard deviation Z score for level of confidence (z = 1.96) How to Calculate : How to Calculate Standard Deviation Divided by Square Root Of Sample Size How to Calculate : How to Calculate Standard Deviation Divided by Square Root Of Sample Size (standard error) How to Calculate : How to Calculate Margin of Error = Standard Error times Z score Example : Example N = 49 Mean = 78 Std Dev = 5 Z score = 1.96 How to Calculate : How to Calculate Square root of sample size = Square root of 49 = 7 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 Standard Error How to Calculate : How to Calculate Standard deviation divided by square root of sample size 5 / 7 = 0.714 Standard Error How to Calculate : How to Calculate Margin of Error = Std Error X Z 0.714 X 1.96 How to Calculate : How to Calculate Margin of Error = Std Error X Z 0.714 X 1.96 = 1.40 What this means : What this means Margin of Error: 95% of the time, the population mean will be within 1.40 of the mean Confidence Interval : Confidence Interval The range of scores from mean – ME to mean + ME Example of Confidence Interval : Example of Confidence Interval The range of scores from 78 – 1.40 to 78 + 1.40 Example of Confidence Interval : Example of Confidence Interval The range of scores from – 1.40 to 78 + 1.40 76.6 to 79.4 To get narrower : To get narrower Have a lower standard deviation To get narrower : To get narrower Have a lower standard deviation Accept a lower level of confidence (e.g., .90 instead of .95) To get narrower : To get narrower Have a lower standard deviation Accept a lower level of confidence (e.g., .90 instead of .95) Use a larger sample size N To get a better level of confidence : To get a better level of confidence Have a lower standard deviation To get a better level of confidence : To get a better level of confidence Have a lower standard deviation Accept a broader confidence interval To get a better level of confidence : To get a better level of confidence Have a lower standard deviation Accept a broader confidence interval Use a larger sample size Use T instead of Z : Use T instead of Z When population SD is not known Use T instead of Z : Use T instead of Z When population SD is not known Use df = N - 1 Margin of Error : Margin of Error & Confidence Intervals headlessprofessor