Suppose that you are interested in finding out if physical exercise 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: anna exercises 3 hours a day and has a gpa of 3.5 bob exercises 5 hours a day and has a gpa of 3.7 charlie exercises 2 hours a day and has a gpa of 3.2 dana exercises 2 hours a day and has a gpa of 3.8 eli exercises 4 hours a day and has a gpa of 3.6 3.1. question 3.1 the dependent variable in this case is: a. gpa b. hours of exercise c. days of exercise d. number of students