Question

Psychologists studied the relative efficacy of three different treatment programs – A, B, and C – on illicit drug abuse. The following data represent the number of days of drug abstinence accumulated by 15 patients (5 in each treatment program) for the 3 months after their treatment program ended. Thus, a larger number of days indicates a longer period free of drug use.
Test the null hypothesis that these drug-treatment programs do not differ in regard to their efficacy.


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  • CreatedOctober 29, 2015
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