Suppose you are interested in using regression analysis to estimate a student's GPA using the following independent variables: the student is a freshman, the student's ACT score, number of hours per week the student studies, the student's GPA in the previous term, the student's GPA in high school, and the number of classes skipped per week. Which of the following independent variables are indicator (dummy) variables? a. the student lives on campus
b. the student's parents graduated from college
c. the student's GPA in high school
d. the number of hours spent in class per week
e. the student is dating
f. number of alcoholic drinks per week the student consumes
g. None of these