Question: 11.7.4 Consider the data from Exercise 11.73. The differ- ence in response between T and H appears to be larger for the low dose than

11.7.4 Consider the data from Exercise 11.73. The differ- ence in response between T and H appears to be larger for the low dose than for the high dose.

(a) Carry out an F test for interactions to assess whether this pattern can be ascribed to chance variation. Let a = 0.10. For these data SS(interaction) = 31.33 and SS(within) 30648.81.

(b) Based on your results in part (a), is it sensible to examine and interpret the main effects of drug and of dose?

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