Question: Analyze the air pollution and mortality data in Table B.15 using all possible regressions. Evaluate the subset models using the Rp 2 , C p

Analyze the air pollution and mortality data in Table B.15 using all possible regressions. Evaluate the subset models using the Rp 2

, C p , and MSRes criteria.

Justify your choice of the fi nal model using the standard checks for model adequacy.

a. Use the all - possible - regressions approach to fi nd the best subset model for rut depth. Use C p as the criterion.

b. Repeat part a using MSRes as the criterion. Did you fi nd the same model?

c. Use stepwise regression to fi nd the best subset model. Did you fi nd the same equation that you found in either part a or b above?

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