13.1 Suppose that E(Y) is related to two predictor variables, X, and X2, by the equation E(Y)=3+x1-2x2

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13.1 Suppose that E(Y) is related to two predictor variables, X, and X2, by the equation E(Y)=3+x1-2x2

a. Graph the relationship between E(Y) and x, when x2 = 2. Repeat for x2 = 1 and for x2 = 0.

b. What relationship do the lines in part a have to one another?

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