. The data shown in the following table were collected in an experiment to opti-

mize crystal growth as a function of three variables .x1, x2, and x5. Large val-

ues of y (yield in grams) are desirable.

Fit a second-order model and analyze

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the fitted surface. Under what set of con- ditions is maximum growth achieved? 32 23 y -1 -1 -1 66 -1 1 70 -1 78 1 60 -1 80 1 1 70 1 1 -1 100 1 1 75 -1.682 0 0 100 1.682 0 0 80 0 -1.682 0 68 0 1.682 0 63 0 0 -1.682 65 0 0 1.682 82 0 0 0 113. 0 0 0 100 0 0 0 118 0 0 0 88 0 0 0 100 0 10 0 85