Suppose that you are interested in finding out if physical exercise helps improving your GPA. You interviewed 5 students - Anna, Bob, Charlie, Dana, and Eli - and asked them each how many hours of exercise they usually do daily and what their GPA is.

The result is as following:
a. Anna exercises 3 hours a day and has a GPA of 3.5
b. Bob exercises 5 hours a day and has a GPA of 3.7
c. Charlie exercises 2 hours a day and has a GPA of 3.2
d. Dana exercises 2 hours a day and has a GPA of 3.8
e. Eli exercises 4 hours a day and has a GPA of 3.6 3.3.

Using regression analysis, the slope of the regression line is

a.. 0.0647
b. 0.0647
c.-0.0341
d. 0.0341