Table 2 Analysis of variance for the fitted quadratic polynomial model of polysaccharides yield

Model

2.94

9

0.33

47.07

<0.0001

X₁

1.30

1

1.30

186.60

<0.0001

X₂

0.61

1

0.61

87.10

<0.0001

X₃

0.49

1

0.49

70.55

<0.0001

X₁ X₂

0.026

1

0.026

3.69

0.0964

X₁ X₃

2.5×10^-3

1

2.5×10^-3

0.36

0.5674

X₂ X₃

4.0×10^-4

1

4.0×10^-4

0.058

0.8172

X₁²

0.060

1

0.060

8.66

0.0216

X₂²

0.088

1

0.088

12.66

0.0092

X₃²

0.33

1

0.33

47.36

0.0002

Residual

0.049

7

6.946×10^-3

Lack of Fit

0.032

3

0.011

2.54

0.1944

Pure Error

0.017

4

4.18×10^-3

Cor Total

2.99

16

R²=0.9837 R²_adj=0.9628 CV=2.21%