Question: Thirty-six cases were randomly divided into four samples. Each person took either a low dose or a high dose of a drug and was queried

Thirty-six cases were randomly divided into four samples. Each person took either a low dose or a high dose of a drug and was queried about either the physical side effects or psychological side effects. Each cell in the matrix below reports the mean number of side effects reported by a sample of nine cases.

(a) Graph the cell means.

(b) Decide if there is an interaction.

(c) Interpret the effect of the two conditions on the two groups.(p. 18)

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