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 ∝ = 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?