To what degree do the attitudes of your peers influence your behavior? A study presented in Social Psychology Quarterly (Vol. 50, 1987) included a sample of n = 143 adult drinkers in an urban setting characterized by a high physical availability of alcoholic beverages. The goal of the study was to build a model relating frequency of drinking alcoholic beverages (y) to attitude toward drinking (x1) and social support (x2). Consider the interaction model
E(y) = β0 + β1x1 + β2x2 + β3x1x2
a. Interpret the phrase “x1 and x2 interact” in terms of the problem.
b. Write the null and alternative hypotheses for deter-mining whether attitude (x1) and social support (x2) interact.
c. The reported p-value for the test suggested in part b was p < .001. Interpret this result.

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