Use the data in SDATA.XLS and statistical software to run the following regression:

where GPA = grade point average and ST = study time per day

(A) Interpret the value you obtained for ˆ

0.

(B) Interpret the value you obtained for ˆ

1.

(C) How much does ˆ

1 typically vary in repeated sampling?

(D) Perform a test of significance on ˆ

1. Show the five-step procedure.

(E) What percent of the variation in GPA is explained by study time?

(F) Perform a test to determine if r 2 = 0. Show the five-step procedure.

(G) According to these results, how many hours per day would study time have to increase in order to raise GPA by 0.1?
(H) Plot the scattergram between GPA and ST with the estimated regression line drawn in.
(I) What is the average distance of an observation from the regression line?
(J) Will you cut back on your study time now that you have seen these results? Explain why or why not.

Transcribed Image Text:

GPA = 0 + ST + e; BST