Refer to Exercise 13.8. a. Fit the model y = β0 + β1x1 + β2x2 + β3x12
Question:
a. Fit the model y = β0 + β1x1 + β2x2 + β3x12 + β4x22 + β5x1x2 + ɛ to the aphid data.
b. Compare the fit of the linear model from Exercise 13.8 to the fully quadratic model fit in part (a) of this exercise.
c. Use residual plots, tests of hypotheses, and other diagnostic statistics to identify possible additional terms to add to the model fit in part (a).
In exercise
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The Minitab output is given here Regression Analysis y versus x 1 x 2 x 1 2 x 2 2 x 1 x 2 The regres...View the full answer
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Related Book For 
An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker
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