Concept explainers
Home Sale Prices. In Example B. 18 on page B-67, we considered the
a. Use the forward selection method to obtain a regression equation for the data. (Take tenter = 2.00, αenter = 0.05.)
b. Use the backward elimination method to obtain a regression equation for the data. (Take tremove = 2.00, αremove = 0.05.)
c. Use stepwise regression to obtain a regression equation for the data. (Take tenter = tremove 2.00, αenter = αremove = 0.05.)
d. Are the regression equations obtained in parts (a), (b), and (c) the same?
e. For the regression equation selected by stepwise regression in part (c), obtain plots of residuals versus fitted values, residuals versus the included predictor variables, and a normal probability plot of the residuals. Perform a residual analysis to assess the appropriateness of the regression equation, constancy of the conditional standard deviations, and normality of the conditional distributions. Check for outliers and influential observations.
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Introductory Statistics (10th Edition)
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