Question: 14.12.1 Twelve overweight subjects participated in a study comparing the effectiveness of three weight-reducing diets. The subjects were grouped according to their initial weight, and

14.12.1 Twelve overweight subjects participated in a study comparing the effectiveness of three weight-reducing diets. The subjects were grouped according to their initial weight, and each of three subjects from each initial weight group was randomly assigned to a diet. The weight loss (in pounds) at the end of the experimental period is given below:

Diet Initial Weight A B C 15C-174 10 23 24 175-199 12 21 26 2OC-224 12 31 21 Over 224 20 28 33

(i) Do these data provide sufficient evidence that (after eliminating the effect of initial weight) the diets are different in their effectiveness? Use cy = 0.01. (ii) Does the initial weight affect the loss of weight?

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