Refer to Grocery retailer Problems 6.9 and 7.4 a. Fit...

Refer to Grocery retailer Problems 6.9 and 7.4 a. Fit regression model (8.58) using the number of cases shipped $\left(X_{1}\right)$ and the binary variable $\left(X_{3}\right)$ as predictors. b. Test whether or not the interaction terms and the quadratic term can be dropped from the model; use $\alpha=.05 .$ State the alternatives, decision rule, and conclusion. What is the $P$ -value of the test?

8.19. Refer to Copier maintenance Problems 1.20 and 8.15. a. Fit regression model (8.49) and state the estimated regression function. b. Test whether the interaction term can be dropped from the model; control the alpha risk at .10. State the alternatives, decision rule, and conclusion. What is the P-value of the test? If the interaction term cannot be dropped from the model, describe the nature of the interaction effect. Data from: http://users.stat.ufl.edu/~rrandles/sta4210/Rclassnotes/data/textdatasets/Chapter%20%201%20Data%20Sets.html 1.20 Data 20 2 60 4 46 3 41 2 12 1 137 10 68 5 89 5 4 1 32 2 144 9 156 10 93 6 36 3 72 4 100 8 105 7 131 8 127 10 57 4 66 5 101 7 109 7 74 5 134 9 112 7 18 2 73 5 111 7 96 6 123 8 90 5 20 2 28 2 3 1 57 4 86 5 132 9 112 7 27 1 131 9 34 2 27 2 61 4 77 5 8.15 Data 1 0 0 0 0 0 1 1 1 1 1 0 0 0 1 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 1 1 1 0 1 1 0 0 0 0 1 1 0 0 0

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