Applied Statistics and Probability for Engineers

14-21

48.00

158.0

50.33 52.67 55.00 57.33 59.67 62.00

160.3

162.7

165.0

167.3

169.7

172.0

Temperature

Time

Contour plot

(a)

62.00

59.20

56.40

53.60

50.80

158.048.00

160.8

163.6

166.4

169.2

172.0

0.3419

0.6080

0.8741

1.140

Temperature Time

std(y)

Surface plot

(b)

0.3500

0.3500

1.000

0.8500

0.7000

1.000

0.8500

0.7000

1.000

0.8500

0.7000

0.4000

0.5000

0.7000

0.85000.6000

∧

Figure S14-15 Plots of constant for a rotatable

central composite design.

2 V 1 yˆ 2

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