Consider the bearing wear data in Exercise 12-23.(a) Find
Chapter 12, Problem 57E(choose chapter or problem)
Consider the bearing wear data in Exercise 12-23.
(a) Find 99% confidence intervals on \(\beta_{1}\) and \(\beta_{2}\).
(b) Recompute the confidence intervals in part (a) after the interaction term \(\mathrm{x}_{1} \mathrm{X}_{2}\) is added to the model. Compare the lengths of these confidence intervals with those computed in part (a) . Do the lengths of these intervals provide any information about the contribution of the interaction term in the model?
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