Use the output from Problem 11 in Chapter 8 and the output given here to answer the
Question:
a. Does the print advertising expenditure confound the relationship between sales (Y) and TV advertising expenditure (X1)?
b. Should print advertising expenditure be included in a model that already contains TV advertising expenditure, based on considerations of precision?
c. In light of your answers to parts (a) and (b), should the final model include both types of advertising expenditures as predictors? Explain.
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Related Book For
Applied Regression Analysis and Other Multivariable Methods
ISBN: 978-1285051086
5th edition
Authors: David G. Kleinbaum, Lawrence L. Kupper, Azhar Nizam, Eli S. Rosenberg
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