Question: 12.13 A study was performed on a type of bearing to find the relationship of amount of wear y to x1 = oil viscosity and

12.13 A study was performed on a type of bearing to find the relationship of amount of wear y to x1 = oil viscosity and x2 = load. The following data were obtained. (From Response Surface Methodology, Myers, Montgomery, and Anderson-Cook, 2009.)
y x1 x2 y x1 x2 193 172 113 1.6 22.0 33.0 851 1058 1357 230 91 125 15.5 43.0 40.0 816 1201 1115

(a) Estimate the unknown parameters of the multiple linear regression equation μY |x1 ,x2 = β0 + β1x1 + β2x2 .

(b) Predict wear when oil viscosity is 20 and load is 1200.

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