Chapter 13Section 2Inference for two-way tablesExample 13.4 Treating Cocaine Addiction Chronic users of cocaine need the drug to feel pleasure. Perhaps giving them a medication that fights depression will help them stay off cocaine. A three year study compared an antidepressant called desipraminewith lithium(a standard treatment for cocaine addiction) and a placebo. The subjects were 72 chronic users randomly assigned to each treatment. Here are the counts and proportions of the subjects who avoided relapse into cocaine use during the study. Group Treatment SubjectsNo relapse Proportion 1 Desipramine 24 14 0.583 2 Lithium 24 6 0.250 3 Placebo 24 4 0.167
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