For the 17 girls who received the family therapy, the changes in weight during the study (which are in the data file Anorexia at the text website) were 11, 11, 6, 9, 14,−3, 0, 7, 22,−5,−4, 13, 13, 9, 4, 6, 11. (a) Verify that ¯y = 7.29, s = 7.18, and se = 1.74. (b) To use the t distribution, explain why df = 16 and a 95% confidence interval uses the t-score of 2.120. (c) Verify that the 95% confidence interval for the population mean change in weight μ for this therapy is (3.6, 11.0). Interpret.

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For the 17 girls who
received the family therapy, the changes in weight during
the study (which are in the data file Anorexia at the text
website) were
11, 11, 6, 9, 14,−3, 0, 7, 22,−5,−4, 13, 13, 9, 4, 6, 11.
(a) Verify that ¯y = 7.29, s = 7.18, and se = 1.74.
(b) To use the t distribution, explain why df = 16 and a
95% confidence interval uses the t-score of 2.120.
(c) Verify that the 95% confidence interval for the population
mean change in weight μ for this therapy is (3.6,
11.0). Interpret.

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