Question: a. When the model is fit to the hops data of Exercise 49, the estimate of b5 is with estimated standard deviation . Test versus

a. When the model is fit to the hops data of Exercise 49, the estimate of b5 is with estimated standard deviation . Test versus

b. Each t ratio for the model of part

(a) is less than 2 in absolute value, yet for this model. Would it be correct to drop each term from the model because of its small t-ratio? Explain.

c. Using for the model of part (a), test

(which says that all second-order terms can be deleted).

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