Advertising and Sales. Refer to Exercise B.85 on page B-113, where we considered the regression of total sales (sales) on expenditures for three primary means of advertising—television (tv), magazines (mag), and radio (radio)—for a household-appliance manufacturer. Use Output B.70 on pages B-116–B-117 to do the following.
- a. Use the maximum-R2 criterion to obtain a regression equation for these data.
- b. Use the adjusted-R2 criterion to obtain a regression equation for these data.
- c. Use the Mallows’ Cp criterion to obtain a regression equation for these data.
- d. Do the three methods used in parts (a), (b), and (c) yield the same final regression equation? If so, is that always the case?
OUTPUT B.70 Output for Exercises B.85, B.99, and B.116
Predictor variable is tv
Predictor variable is mag
Predictor variable is radio
OUTPUT B.70 (cont.) Output for Exercises B.85, B.99, and B.116
Predictor variables are tv and mag
Predictor variables are tv and radio
Predictor variables are mag and radio
Predictor variables are tv, mag, and radio
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