Question: In Example 12.8, a case is made for eliminating x , powder temperature, from the model since the P-value based on the F-test is 0.2156

In Example 12.8, a case is made for eliminating x , powder temperature, from the model since the P-value based on the F-test is 0.2156 while P-values for x and x are near zero.

1. Reduce the model by eliminating x , thereby producing a full and a restricted (or reduced) model, and compare them on the basis of .

2. Compare the full and restricted models using the width of the 95% prediction intervals on a new observation. The better of the two models would be that with the tightened prediction intervals. Use the average of the width of the prediction intervals.

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