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:
Concentration, x
Compressive Strength, y
10
25.2
27.3
28.7
15
29.8
31.1
27.8
20
31.2
32.6
29.7
25
31.7
30.1
32.3
30
29.4
30.8
32.8
(a) Estimate the quadratic regression equationμY |x=β0 +β1x+β2x2.
(b) Test for lack of fit of the model.
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