Question: Reconsider the electronic inverter data in Table B.14 . In Problems 10.24 and 10.25, you built regression models for the data using different variable selection

Reconsider the electronic inverter data in Table B.14 . In Problems 10.24 and 10.25, you built regression models for the data using different variable selection algorithms. Suppose that you now learn that the second observation was incorrectly recorded and should be ignored.

a. Fit a model to the modifi ed data using all possible regressions, using C p as the criterion. Compare this model to the model you found in Problem 10.24.

b. Use stepwise regression to fi nd an appropriate model for the modifi ed data. Compare this model to the one you found in Problem 10.25.

c. Calculate the confi dence intervals as the mean response for all points in the modifi ed data set. Compare these results with the confi dence intervals from Problem 10.26. Discuss your fi ndings.

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