In Exercise 12.28, page 462, we have the following data
Chapter 12, Problem 12.59(choose chapter or problem)
In Exercise 12.28, page 462, we have the following data concerning wear of a bearing: y (wear) x1 (oil viscosity) x2 (load) 193 230 172 91 113 125 1.6 15.5 22.0 43.0 33.0 40.0 851 816 1058 1201 1357 1115 (a) The following model may be considered to describe the data:yi = 0 + 1x1i + 2x2i + 12x1ix2i +i,for i =1 ,2,...,6. The x1x2 is an interaction term. Fit this model and estimate the parameters. (b) Use the models (x1), (x1,x2), (x2), (x1,x2,x1x2) and compute PRESS, Cp, and s2 to determine the best model.
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