Advertising and Sales, continued Refer toExercise 13.26. Use a computer software package

Chapter 13, Problem 27

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Advertising and Sales, continued Refer toExercise 13.26. Use a computer software package toperform the multiple regression analysis and obtaindiagnostic plots if possible.a. Comment on the fit of the model, using the analysisof variance F-test, R2, and the diagnostic plotsto check the regression assumptions.b. Find the prediction equation, and graph the threedepartment sales lines.c. Examine the graphs in part b. Do the slopes of thelines corresponding to the childrens wear B andmens wear A departments appear to differ? Testthe null hypothesis that the slopes do not differ(H0 : b4 0) versus the alternative hypothesis thatthe slopes are different.d. Are the interaction terms in the model significant?Use the methods described in Section 13.5to test H0 : b4 b5 0. Do the results of thistest suggest that the fitted model should bemodified?e. Write a short explanation of the practical implicationsof this regression analysis.

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