Bulimia Although there are many treatments for bulimia nervosa, some subjects fail to benefit from treatment. In a study to determine which factors predict who will benefit from treatment, an article in the British Journal of Clinical Psychology indicates that self-esteem was one of these important predictors.4 The table gives the mean and standard deviation of self-esteem scores prior to treatment, at post treatment, and during a follow-up:
 | Pretreatment | Post treatment | Follow-up |
Sample Mean | 20.3 | 26.6 | 27.7 |
Standard Deviation s | 5.0 | 7.4 | 8.2 |
Sample Size n | 21 | 21 | 20 |
a. Use a test of hypothesis to determine whether there is sufficient evidence to conclude that the true pretreatment mean is less than 25.
b. Construct a 95% confidence interval for the true post treatment mean.
c. In Section 10.4, we will introduce small-sample techniques for making inferences about the difference between two population means. Without the formality of a statistical test, what are you willing to conclude about the differences among the three sampled population means represented by the results in the table?
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