Dr Smithwick Was Determined to Find a Cure for Alcoholism

Dr. Smithwick was determined to find a cure for alcoholism. A pill was developed that made the individual vomit if they consumed any alcohol, thereby curbing an alcoholic's desire to drink. He designed an experiment with one treatment group. Number of drinks consumed was used as a dependent variable. Individuals were first measured in a baseline phase, then a treatment phase, followed by another baseline phase. This is a classic example of a(n) :

A) independent samples design.
B) multiple case design.
C) A-B-C design.
D) A-B-A design.

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