Suppose E(y) is related to two predictor variablesx1 and
Chapter 13, Problem 18(choose chapter or problem)
Suppose E(y) is related to two predictor variablesx1 and x2 by the equationE(y) 3 x1 2x2 x1x2a. Graph the relationship between E(y) and x1 whenx2 0. Repeat for x2 2 and for x2 2.b. Repeat the instructions of part a for the modelE(y) 3 x1 2x2c. Note that the equation for part a is exactly the sameas the equation in part b except that we have addedthe term x1x2. How does the addition of the x1x2term affect the graphs of the three lines?d. What flexibility is added to the first-order modelE(y) b0 b1x1 b2x2 by the addition of theterm b3x1x2, using the model E(y) b0 b1x1b2x2 b3x1x2?
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