Question: 15.35 Use the coal cleansing data of Exercise 15.2 on page 629 to fit a model of the type E(Y ) = 0 + 1x1

15.35 Use the coal cleansing data of Exercise 15.2 on page 629 to fit a model of the type E(Y ) = β0 + β1x1 + β2x2 + β3x3 , where the levels are x1 , percent solids: 8, 12 x2 , flow rate: 150, 250 gal/min x3, pH:5,6 Center and scale the variables to design units. Also conduct a test for lack of fit, and comment concerning the adequacy of the linear regression model.

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