Consider the data from Exercise 11.7.3.The difference in response between T and H appears to be larger

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Consider the data from Exercise 11.7.3.The difference 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 α = 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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Statistics For The Life Sciences

ISBN: 9780321989581

5th Edition

Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner

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