2.3 For the flour beetle data of Table 1.4, we may focus on the endpoint mortality data, corresponding to the observations on day 13. A logistic or logit analysis of these data is based on the model, Pr(death by day 13 on dose di) = [1 + exp{−(α1s + α2s log di)}]

−1, where s = 1, 2 is the index used to indicate sex. Draw appropriate graphs to investigate whether this may be a suitable way to describe the endpoint mortality data. Comment on the differences observed between the responses of the two sexes. Write down the likelihood.