For Exercise 11.33, see page 550; for 11.34 and 11.35, see page 554; for 11.36 and 11.37, see page 555; for 11.38, see page 558; for 11.39, see page 559; and for 11.40 and 11.41, see pages 560–561.
11.41 Is Opening helpful when Budget and Theaters are available?
CASE 11.2 We saw that Budget and Theaters are not useful in a model that contains the opening-weekend revenue. Now, let’s examine the other version of this question. Does Opening help explain USRevenue in a model that contains Budget and Theaters? Run the models with all three predictors and with only Budget and Theaters. Compare the values of . Perform the test and give its degrees of freedom and -value. Carefully state a conclusion about the usefulness of the predictor Opening when Budget and Theaters are available. Also compare this -test and -value with the test for the coefficient of Opening in Example 11.13.
11.41
The value for all three predictors is 0.7156. The value for just Budget and Theaters is 0.4355. . Opening does contribute significantly to explaining U.S. box office revenue when Budget and Theaters are already in the model. The conclusion is the same as the test.
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