Suppose you are interested in using regression analysis to estimate a student's GPA using the following independent variables: the number of roommates the student has, the student is dating, the student's major, the student is employed, the student owns a car, and number of siblings the student has. Which of the following independent variables are indicator (dummy) variables? Select all that apply.

1)the number of roommates the student has

2)the student is dating

3)the student's major

4)the student is employed

5) the student owns a car

6)number of siblings the student has

7)None of these