Please see attached/two part question. Both attached slides are different.

15.7 Practice Ch eck My Work Consider a regression study involving a dependent variable y, a quantitative independent variable Ci, and a categorical independent variable with two levels (level 1 and level 2). a. Write a multiple regression equation relating and the categorical variable to y. 40 + + 2Z2 Selut your Enter the values of dummy variable that are used to indicate the two levels of the qualitative variable. If your answer is zero, enter "O". Level 1 Level 2 b. What is the expected value of y corresponding to level 1 of the categorical variable? 40 + go + 2Z2 Selut your c. What is the expected value of y corresponding to level 2 of the categorical variable? go + 2Z2 Selut you d. Interpret the parameters in your regression equation. l is the change in E(y) for a 1 unit change in - Select you holding the categorical variable constant.