a. When the model Y 0 1x1 2x2 3 x2 1 4 x2 2 5 x1x2 !is fit
Chapter 13, Problem 13.50(choose chapter or problem)
a. When the model Y 0 1x1 2x2 3 x2 1 4 x2 2 5 x1x2 !is fit to the hops data of Exercise 49, the estimate of 5 is 5 .557 with estimated standard deviation s 5 .94. Test H0: 5 0 versus Ha: 5 0. b. Each t-ratio i /s i (i 1, 2, 3, 4, 5) for the model of part (a) is less than 2 in absolute value, yet R2 .861 for this model. Would it be correct to drop each term from the model because of its small t-ratio? Explain. c. Using R2 .861 for the model of part (a), test H0: 3 4 5 0 (which says that all second-order terms can be deleted). 51.
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