Applied Statistics and Probability for Engineers

14-18

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

1 172.0

• 1

x^2

(temperature)

x 1 (time)

• 1+1 0

0

Contour plot

(a)

62.00

59.20

(b)

56.40

53.60

50.80

158.048.00

160.8

163.6

166.4

169.2

172.0

61.45

64.34

67.23

70.12

x 2 (temperature) x 1 (time)

Conversion

+1

(^00)
+1

• 1 – 1
  Surface plot

70.00

69.00

68.00

67.00

66.00

65.00

64.00

63.00

65.00

64.00

Figure S14-11

Response surface plots

in the yield response,

Example S14-4.

Table S14-9 Analysis of Variance for the First-Order Model, Viscosity Response

Source of Sum of Degrees of Mean

Variation Squares Freedom Square f 0 P-Value

Model 195.4 2 97.72 15.89 0.0008

Residual 61.5 10 6.15

Total 256.9 12

Independent Coefficient Degrees of Standard tfor H 0

Variable Estimate Freedom Error Coefficient  0 P-Value

Intercept 37.08 1 0.69 53.91

x 1 3.85 1 0.88 4.391 0.0014

x 2 3.10 1 0.88 3.536 0.0054

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