Consider a regression study involving a dependent variable y, a quantitative independent variable a1, and a categorical independent variable with two levels (level 1 and level 2). a. Write a multiple regression equation relating ai and the categorical variable to y. 1. E(y) = Bo + B11 2. E(y) = Bo + B2x2 3. E(y) = Bo +B11 + B2 4. E(y) = Bo + B, 1 + B222 Option 4 Enter the values of dummy variable xz that are used to indicate the two levels of the qualitative variable. If your answer is zero, enter "0". Level 1 Level 2 b. What is the expected value of y corresponding to level 1 of the categorical variable? 1. E(y) = Bo + B11 2. E(y) = Bo + B2a2 3. E(y) = Bo + B1a1 + B2 4. E(y) = Bo + B1 1 + Bz72

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