40 rats were given divided randomly into four groups and assigned to one of four treatments: placebo, drug A, drug B, or both drug A and drug B. Response is a standard measure of physiological arousal.
A data frame with 40 observations, 10 in each of 4 columns the corresponding to placebo, drug A, drug B and both drug A and drug B; no NAs.
Rats receiving a placebo treatment.
Rats receiving only drug A.
Rats receiving only drug B.
Rats receiving both drug A and drug B.
Richard Lowry. Concepts & Applications of Inferential Statistics. Vassar College, Poughkeepsie, N.Y., 2010, http://faculty.vassar.edu/lowry/webtext.html
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