Question: Reconsider the heat treating data from Table B.12 . Fit a model to the PITCH response using the variables x SOAKTIME SOAKPCT x DIFFTIME DIFFPCT

Reconsider the heat treating data from Table B.12 . Fit a model to the PITCH response using the variables x SOAKTIME SOAKPCT x DIFFTIME DIFFPCT 1 2 = × =× and as regressors. How does this model compare to the one you found by the all - possible - regressions approach of Problem 10.17?

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