Ten individuals have participated in a diet-modification program to stimulate weight loss. Their weight both before and after participation in the program is shown in the following list.

(a) Is there evidence to support the claim that this particular diet-modifi cation program is effective in producing a mean weight reduction? Use α = 0.05.

(b) Is there evidence to support the claim that this particular dietmodifi cation program will result in a mean weight loss of at least 10 pounds? Use α = 0.05.

(c) Suppose that, if the diet-modifi cation program results in mean weight loss of at least 10 pounds, it is important to detect this with probability of at least 0.90. Was the use of 10 subjects an adequate sample size? If not, how many subjects should have been used?

Subject Before After 1 195 187 2 213 195 3 247 221 4 201 190 187 175 210 197 215 199 246 8. 221 9. 294 278 10 310 285