10.93 Anorexia again Refer to Exercise 10.89, comparing mean weight changes in anorexic girls for cognitive behavioral therapy and a control group. The MINITAB output shows results of doing analyses while assuming equal population standard deviations.

a. Interpret the reported confidence interval.

b. Interpret the reported P-value.

c. What would be the P-value for Ha: m1 7 m2?
Interpret it.

d. What assumptions do these inferences make?

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MINITAB output for comparing mean weight changes cogchange controlchange N 29 26 Mean StDev 3.01 7.31 -0.45 7.99 SE Mean 1.4 1.6 Difference (cogchange) - (controlchange) Estimate for difference: 3.46 95% CI for difference: (-0.68, 7.59) T-Test of difference = 0 (vs): - T-Value = 1.68 P-Value = 0.100 DF = 53 Both use Pooled StDev = 7.6369