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 ? Y?x = ?0 + ?1x + ?2x2

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

Concentration, Compressive Strength, y 25.2 29.8 31.2 31.7 29.4 27.3 28.7 27.8

Concentration, Compressive Strength, y 25.2 29.8 31.2 31.7 29.4 27.3 28.7 27.8 10.0 15.0 20.0 25.0 31.1 32.6 29.7 32.3 30.1 32.8 30.0 30.8

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