The experiment described in Example 15.4 also gave data on change in body fat mass for men (€œGrowth Hormone and Sex Steroid Administration in Healthy Aged Women and Men,€ Journal of the American Medical Association [2002]: 2282€“2292). Each of 74 male subjects who were over age 65 was assigned at random to one of the following four treatments: (1) placebo €œgrowth hormone€ and placebo €œsteroid€ (denoted by P + P); (2) placebo €œgrowth hormone€ and the steroid testosterone (denoted by P + S); (3) growth hormone and placebo €œsteroid€ (denoted by G + P); and (4) growth hormone and the steroid testosterone (denoted by G + S). The accompanying table lists data on change in body fat mass over the 26-week period following the treatment that are consistent with summary quantities given in the article.

- 2.139. Carry out an F test to see whether mean change in body fat mass differs for the four treatments.

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