Table 5 Regression coefficients and statistical significance for the quadratic model.

From: Agro-waste as a substrate for the production of pullulanase by Penicillium viridicatum under solid-state fermentation

Source

Sum of squares

Df

Mean square

F value

p-value prob > F

Model

402.33

9

44.70

98.67

< 0.0001*

A-FeSO4

12.50

1

12.50

27.59

0.0012*

B-MnSO4

1.58

1

1.58

3.50

0.1037**

C-MgSO4

1.17

1

1.17

2.58

0.1520**

AB

30.53

1

30.53

67.38

< 0.0001*

AC

38.50

1

38.50

84.99

< 0.0001*

BC

106.81

1

106.81

235.77

< 0.0001*

A2

50.22

1

50.22

110.86

< 0.0001*

B2

63.67

1

63.67

140.55

< 0.0001*

C2

75.29

1

75.29

166.20

< 0.0001*

Residual

3.17

7

0.45

  

Lack of Fit

1.68

3

0.56

1.50

0.3427

CV:1.19

R2: 99.2

Adjusted R2: 98.2%

 

Predicted R2:92.8%

 
  1. Symbols used: *, Significant terms; **, non-significant terms; AB-interactive term for FeSO4 and MnSO4; AC-interactive term for FeSO4 and MgSO4; BC-interactive term for MSO4 and MgSO4.
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