32. Consider a regression study involving a dependent variable y, a quantitative independent variable x1, and a

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32. Consider a regression study involving a dependent variable y, a quantitative independent variable x1, and a qualitative variable with two levels (level 1 and level 2).

a. Write a multiple regression equation relating x1 and the qualitative variable to y.

b. What is the expected value of y corresponding to level 1 of the qualitative variable?

c. What is the expected value of y corresponding to level 2 of the qualitative variable?

d. Interpret the parameters in your regression equation.

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