Question

3. This data is from #4 in the Correlation (Ch. 7) homework. The correlation is r = .73. Answer the following:

a. Predict the number of courses June is taking based on the fact that she missed 7 classes.

b. Predict the number of courses Jordan is taking based on the fact that he missed 5 classes.

c. Find the standard error of the estimate. What does this tell you about your predictions?

You are interested in whether the number of classes students miss (X) during a semester is related to the number of classes they are taking (Y).

Participant Classes missed Number of courses

1 3 3

2 8 5

3 9 6

4 6 5

5 4 5

6 3 4

7 2 5

8 10 6

This data is from #5 in the Correlation (Ch. 7) homework. The correlation is r = .77. Answer the following:

a. Predict the GPA from an ACT score of 22.

b. Predict the GPA from an ACT score of 25.

c. Find the standard error of the estimate. What does this tell you about your predictions?

A researcher is interested in examining the relationship between ACT scores and college GPA.

Participant ACT GPA

1 24 2.75

2 28 3.25

3 29 3.50

4 35 3.75

5 34 4.00

6 30 3.8

7 29 2.60

8 27 2.68

9 31 3.36

Answer 1

3.

Please follow the table for calculations:

4.

Standard error estimate tells us about the accuracy of our predictions.