| Shoe Size |
| 12 |
| 6 |
| 11 |
| 13 |
| 8 |
| 9 |
| 8 |
| 8 |
| 9 |
| 9 |
| 11 |
| 5 |
| 10 |
| 8 |
| 7 |
| 7 |
| 11 |
| 9 |
| 9 |
| 9 |
| 12 |
| 8 |
| 8 |
| 8 |
| 12 |
| 9 |
| 11 |
| 8 |
| 11 |
| 8 |
| 13 |
| 5 |
| 9 |
| 8 |
| 11 |
We need to find the confidence interval for the SHOE SIZEvariable. To do this, we need to find the mean and standarddeviation with the Week 1 spreadsheet. Then we can the Week 5spreadsheet to find the confidence interval. This does not need tobe separated by males and females, rather one interval for theentire data set.
First, find the mean and standard deviation by copying the SHOESIZE variable and pasting it into the Week 1 spreadsheet. Writedown the mean and the sample standard deviation as well as thecount. Open the Week 5 spreadsheet and type in the values needed inthe green cells at the top to find the confidence interval.
- Give and interpret the 95% confidence interval for the size ofstudents’ shoes.
Change the confidence level to 99% to find the 99% confidenceinterval for the SHOE SIZE variable.
- Give and interpret the 99% confidence interval for the size ofstudents’ shoes.
- Compare the 95% and 99% confidence intervals for the size ofstudents’ shoes. Explain the difference between these intervals andwhy this difference occurs.
We need to find the confidence interval for the SHOE SIZEvariable. To do this, we need to find the mean and standarddeviation with the Week 1 spreadsheet. Then we can the Week 5spreadsheet to find the confidence interval. This does not need tobe separated by males and females, rather one interval for theentire data set. First, find the mean and standard deviation by copying the SHOESIZE variable and pasting it into the Week 1 spreadsheet. Writedown the mean and the sample standard deviation as well as thecount. Open the Week 5 spreadsheet and type in the values needed inthe green cells at the top to find the confidence interval. - Give and interpret the 95% confidence interval for the size ofstudents’ shoes.
Change the confidence level to 99% to find the 99% confidenceinterval for the SHOE SIZE variable. - Give and interpret the 99% confidence interval for the size ofstudents’ shoes.
- Compare the 95% and 99% confidence intervals for the size ofstudents’ shoes. Explain the difference between these intervals andwhy this difference occurs.
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