Table 4 ANOVA for response surface quadratic models

Model

21.76

9

39.82

< 0.0001

X₁

0.12

1

2.02

0.1985

X₂

0.051

1

0.84

0.3890

X₃

6.90

1

113.65

< 0.0001

X₁X₂

0.13

1

2.13

0.1874

X₁X₃

0.034

1

0.56

0.4773

X₂X₃

1 × 10^–4

1

1.647 × 10^–3

0.9688

X₁²

0.23

1

3.72

0.0949

X₂²

0.32

1

5.22

0.0563

X₃²

13.44

1

221.37

< 0.0001

Residual

0.43

7

Lack of fit

0.25

3

1.99

0.2572

Pure error

0.17

4

C Total

22.19

16

R²

0.9808

R²_adj

0.9562

Adep Precision

16.739