AP Statistics Chapter 24 Comparing Means



Chapter 24 Reading Guide

“Comparing Means”

1. What type of graph do we use to compare two groups of data?

2. What is the formula for the standard deviation of the difference of the means?

3. What is the formula for the standard error of the difference of the means?

4. What is the formula for the confidence interval for the difference of the means?

5. What is the formula for the Margin of Error for the difference of the means?

6. What is the formula for the Degrees of Freedom for the difference of the means? (see footnote)

7. What is the formula for the t value for the difference of the means?

8. The nearly normal conditions list 15 and 40 as numbers of importance. Explain.

9. Give an example of two groups that would not be independent, so we would not use the methods in this chapter.

Read through the Step by Step Example on pages 565 – 567.

Read the Ti Tips on pages 567 – 568 and be able to do this on your calculator.

Do the “Just Checking” on page 568.

10. What is delta sub naught?

Read through the Step by Step Example on pages 570 – 572.

Read the Ti Tips on page 572 and be able to do this on your calculator.

Do the “Just Checking” on page 573.

11. When do you choose to use a pooled t-test?

Note: It is never wrong not to pool. DON’T POOL!

12. Give an example of when pooling would work.

13. Give an example of What Can Go Wrong and paired data.

14. Give and example of What Can Go Wrong and Look at the Plots.

Chapter 24 Assignment: pages 579 – 586 #7, 9, 10, 15, 17, 19, 22, 27, 36.

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