Data on sales revenue Y, television advertising expenditures X1, and print media advertising expenditures X2 for a
Question:
Data on sales revenue Y, television advertising expenditures X1, and print media advertising expenditures X2 for a large retailer for the period 1988-1993 were given in Problem 11 of Chapter 8. Use the computer output for that problem, along with the additional portions of the output shown here, to answer the following questions.
a. Perform the overall F test for the regression of Y on both independent variables. Interpret your result.
b. Perform variables-added-in-order tests for both independent variables, with X1 added first.
c. Perform variables-added-in-order tests for both independent variables, with X2 added first.
d. Provide a table of variables-added-last tests.
e. Which predictors appear to be necessary? Why?
Step by Step Answer:
Applied Regression Analysis And Other Multivariable Methods
ISBN: 632
5th Edition
Authors: David G. Kleinbaum, Lawrence L. Kupper, Azhar Nizam, Eli S. Rosenberg