Problem 13.3 The table below lists the final weight (in grams) of 18 hamsters fed three different diets varying in fat content. The hamsters were blocked by weight in groups of three; that is, the hamsters in each block had the same weights at the start of the experiment.

(a) Estimate the overall mean, the treatment means, and the block means.

(b) Compare the three diets and test for differences among them by computing the ANOVA table. Use α = 0.05.

(c) Check the model assumptions by plotting the residuals. Block Treatment 1 23456 1 96 96 94 99 99 102 2 103 101 103 105 101 107 3 103 104 106 108 109 110