You are interested in predicting the amount of body fat on aman y using the explanatory

Chapter 0, Problem 28.21

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You are interested in predicting the amount of body fat on aman y using the explanatory variables waist size x1 and height x2.(a) Do you think body fat y and waist size x1 are positively correlated? Explain.(b) For a fixed waist size, height x2 is negatively correlated with body fat y.Explain why.(c) The slope of the simple linear regression line for predicting body fat fromheight for a sample of men is almost 0, say 0.13. Knowing a mans height does nottell you much about his body fat. Do you think this parameter estimate wouldbecome negative if a multiple regression model with height x2 and waist size x1was used to predict body fat? Explain.

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