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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 pvalue of this test?
(d) Estimate the change in E (Y ) for every 1unit increase in x1 when x2 = 2.
(e) Estimate the change in E (Y ) for every 1unit 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.
 Spring '08
 Stepanov
 Statistics

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