Bulimia study. The “fear of negative evaluation” (FNE)

scores for 11 female students known to suffer from the eating disorder bulimia and 14 female students with normal eating habits, first presented in Exercise 2.44

(p. 80), are reproduced in the next table. (Recall that the higher the score, the greater is the fear of a negative evaluation.)

a. Locate a 95% confidence interval for the difference between the population means of the FNE scores for bulimic and normal female students on the MINITAB printout shown on page 478. Interpret the result.

b. What assumptions are required for the interval of part a to be statistically valid? Are these assumptions reasonably satisfied? Explain.

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Bulimic students: 21 13 10 20 25 19 16 21 24 13 14 Normal students: 13 6 16 13 8 19 23 18 11 19 7 10 15 20