Questions 8-10 refer to the following information: Let D be a dummy variable, while X and Y are continuous variables. You have the following regression model: Y=Bo+BIX+B2D+ B;XD+e. 8. If D=0, then the effect of a one unit increase of X on the expected value of Y is: A) B1+83 B) B2 C) B1 D) B2+83 E) B3 9. When X=5 and D=1, then which of the following is true? A) E[Y]= Bo+5(Bi+ B2)+ B3 B) Y= Bo+581 C) E[Y]= Bo+5(Bi+ B3)+ B2 D) Y= 30+5(B1+ B2) E) Y= Bo+5(Bi+ B3)+ Bz 10. When the dummy variable switches from 0 to 1, then for any value of X, the change in the expected value of Y is: A) B2+ B3X B) B2+(Bi+ B3)X