19 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 40, are reproduced in the next table and saved in the BULIMIA file. (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 at the bottom of the page. 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 Based on Randles, R. H. "On neutral responses (zeros) in the sign test and ties in the Wilcoxon-Mann-Whitney test." The American Statistician, Vol. 55, No. 2, May 2001 (Figure 3).