Understanding the fitted regression line. The fitted

Chapter , Problem 11.2

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Understanding the fitted regression line. The fitted regression equation for a multiple regression is y 1.8 6.1x1 1.1x2 (a) If x1 3 and x2 1, what is the predicted value of y? (b) For the answer to part (a) to be valid, is it necessary that the values x1 3 and x2 1 correspond to a case in the data set? Explain why or why not. (c) If you hold x2 at a fixed value, what is the effect of an increase of two units in x1 on the predicted value of y? USE

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