Anorexia Treatment. Anorexia nervosa is a serious eating disorder, particularly among young women. The following data provide the weights, in pounds, of 17 anorexic young women before and after receiving a family therapy treatment for anorexia nervosa.

[SOURCE: D. Hand et al., ed., A Handbook of Small Data Sets, London: Chapman & Hall, 1994; raw data from B. Everitt (personal communication)]

Before After Before After Before After 83.3 94.3 76.9 76.8 82.1 95.5 86.0 91.5 94.2 101.6 77.6 90.7 82.5 91.9 73.4 94.9 83.5 92.5 86.7 100.3 80.5 75.2 89.9 93.8 79.6 76.7 81.6 77.8 86.0 91.7 87.3 98.0 83.8 95.2 Does family therapy appear to be effective in helping anorexic young women gain weight? Perform the appropriate hypothesis test at the 5% significance level.