Question: The following is a set of coded experimental data on the compressive strength of a particular alloy at various values of the concentration of some

The following is a set of coded experimental data on the compressive strength of a particular alloy at various values of the concentration of some additive:

(a) Estimate the quadratic regression equation μY |x = β0 + β1x + β2x2.

(b) Test for lack of fit of the model.

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