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The effectiveness of antidepressants in treating the eating disorder bulimia was examined in the article “Bulimia...

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The effectiveness of antidepressants in treating the eatingdisorder bulimia was examined in the article “Bulimia Treated withImipramine: A Placebo-Controlled Double-Blind Study” (AmericanJournal of Psychology [1983]: 554–558). A group of patientsdiagnosed with bulimia were randomly assigned to one of twotreatment groups, one receiving imipramine and the other a placebo.One of the variables recorded was binge frequency. The authorschose to analyze the data using a rank-sum test because it makes noassumption of normality. They stated that “because of the widerange of some measures, such as frequency of binges, the rank sumis more appropriate and somewhat more conservative.” Data on numberof binges during one week that are consistent with the ?ndings ofthe article are given in the following table:

Placebo 8 3 15 3 4 10 6 4

Imipramine 2 1 2 7 3 12 1 5

Do these data strongly suggest that imipramine is effective inreducing the mean number of binges per week? Use a level .05rank-sum test.

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