Does the rate of serious mental illness among substance abusers vary according to the type of substance

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Does the rate of serious mental illness among substance abusers vary according to the type of substance abused? To find out, a psychiatrist collected data on the mental health of a random sample of substance abusers: drug abusers, alcohol abusers, and abusers of both drugs and alcohol. His results were as follows:

Using chi-square, test the null hypothesis that the prevalence of serious mental illness does not differ by type of substance abuse.

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Elementary Statistics In Social Research

ISBN: 9780205845484

12th Edition

Authors: Jack A. Levin, James Alan Fox, David R. Forde

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