# 05 b do x1 and x2 interact perform the appropriate

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Unformatted text preview: x1*x2) )\$coefficients x1 x2 I(x1 * x2) 5 -2 3 (a) Perform the signiﬁcance of the regression test at α = 0.05. (b) Do x1 and x2 interact? Perform the appropriate test at α = 0.05. (c) Is there suﬃcient evidence to indicate that x2 contributes information for the prediction of y ? Perform the appropriate test at α = 0.05. What is the p-value of this test? (d) Estimate the change in E (Y ) for every 1-unit increase in x1 when x2 = 2. (e) Estimate the change in E (Y ) for every 1-unit increase in x2 when x1 = 3. STAT 420 Spring 2014: HW 7 4 University of Illinois...
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## This homework help was uploaded on 04/03/2014 for the course STAT 420 taught by Professor Stepanov during the Spring '08 term at University of Illinois, Urbana Champaign.

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