Response Surface for Variable Y₂

Response Mean

85.699259

Root MSE

0.400332

R-Square

0.9891

Coefficient of Variation

0.4671

Regression

Degrees of Freedom

Sum of Squares

R-Square

F Value

Prob>F

Linear

4

163.782850

0.9324

255.49

< 0.0001

Quadratic

4

2.709944

0.0154

4.23

0.0231

Cross-product

6

7.246400

0.0413

7.54

0.0016

Total Regress

14

173.739194

0.9891

77.43

< 0.0001

Parameter

Degrees of Freedom

Parameter estimate

Standard error

t Value

Prob > |T|

Intercept

1

109.127500

23.807435

4.58

0.0006

X₁₁

1

-0.343292

0.195183

-1.76

0.1041

X₁₂

1

0.677750

2.421376

2.80

0.0161

X₁₃

1

1.203500

4.842753

2.49

0.0287

X₁₄

1

1.231917

0.250274

4.92

0.0004

X₁₁^*X₁₁

1

0.000771

0.000433

1.78

0.1006

X₁₂^*X₁₁

1

-0.000700

0.010008

-0.7

0.4976

X₁₂^*X₁₂

1

-0.004304

0.173349

-2.48

0.0288

X₁₃^*X₁₁

1

-0.004825

0.020017

-2.41

0.0329

X₁₃^*X₁₂

1

0.003650

0.400332

0.91

0.3799

X₁₃^*X₁₃

1

-0.005917

0.693396

-0.85

0.4102

X₁₄^*X₁₁

1

-0.003588

0.001001

-3.58

0.0038

X₁₄^*X₁₂

1

-0.010050

0.020017

-5.02

0.0003

X₁₄^*X₁₃

1

0.000650

0.040033

0.16

0.8737

X₁₄^*X₁₄

1

-0.003017

0.001733

-1.74

0.1074

Factor

Degrees of Freedom

Sum of Squares

Mean Square

F-Ratio

Prob > F

X₁₁

5

148.900687

29.780137

185.82

< 0.0001

X₁₂

5

14.235779

2.847156

17.77

< 0.0001

X₁₃

5

5.233773

1.046755

6.53

0.0005

X₁₄

5

12.002531

2.400506

14.98

< 0.0001