hw_06_sol - Homework 6 Covers Chapters 9 and 10 Use the...

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Homework 6 Covers Chapters 9 and 10 Use the High School and Beyond (HSB) data set. The data is explained in the HSB Read Me file. USE MATH AS PREDICTOR 1. Some researchers feel an interaction exists between Gender and Writing ability. Create an Gender*Writing interaction term. Based on the 14 predictor variables, how many models are possible (assume an intercept for all models)? 2 14 = 16,384 2. Using Math as predictor, analyze the data using Minitab Backward, Forward, and Stepwise Regression (keep default settings). Specify the “best” regression equation identified by these three methods. How many steps did it take for each method? Do they agree? Backward: Math = 32.68 - 2.21Gender + 1.02SES + 0.106CAR + 0.378RDG + 0.371cWRTG Steps: 8 Forward: Math = 32.63 + 0.362RDG + 0.362cWRTG - 2.30Gender + 0.92SES + 0.103CAR + 0.65LOCUS + 0.34 RACE Steps: 7 Stepwise: Math = 33.53 + 0.367RDG + 0.365cWRTG - 2.30Gender + 0.94SES + 0.99CAR + 0.66LOCUS Steps: 6 Agree? No, they do not agree. 3.
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hw_06_sol - Homework 6 Covers Chapters 9 and 10 Use the...

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