Using the data given in Problem 2 in Chapter 5 (with SBP as the dependent variable) and the accompanying computer output, find the best regression model, using α = .05 and the independent variables AGE, QUET, and SMK as follows.
a. Use the forward approach.
b. Use the backward approach.
c. Use the all possible regressions approach.
d. Based on your results in parts (a) through (c), select a model for further analysis to determine which, if any, of the following interaction (i.e., product) terms should be added to the model: AQ = AGE × QUET, AS = AGE × SMK, QS = QUET × SMK, and AQS = AGE × QUET × SMK.
Regression Models for Dependent Variable: SBP
SSY = 6425.97, N = 32
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