Question: 5.24. Example 5.5 (page 120) analyzed data from a study that compared therapies for anorexia. For the 17 girls who received the family therapy, the

5.24. Example 5.5 (page 120) analyzed data from a study that compared therapies for anorexia. For the 17 girls who received the family therapy, the changes in weight during the study were 11,11,6,9,14, -3,0,7,22, -5, -4.13,13,9.4.6,11.

(a) Verify that y = 7.29 and x = 7.18 pounds.

(b) Verify that the standard error of the sample mean was 1.74.

(c) To use the t distribution, explain why df — 16 and a 95% confidence interval uses the /-score of 2.120.

(d) Let /r denote the population mean change in weight for this therapy. Verify that the 95% confidence interval for n is (3.6, 11.0).

Interpret.

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