Table 5.

Analysis of variance (ANOVA) for response surface quadratic model for the production of inulinase.

Source	Coefficient factor	Sum of squares	DF	F	P > F
Model	59.43	5756.33	14	7.37	0.0002
X1	−4.17	416.67	1	7.47	0.0154
X2	−4.25	433.50	1	7.78	0.0138
X3	3.25	253.50	1	4.55	0.0499
X4	3.17	240.67	1	4.32	0.0553
X1∗X2	−1.00	16.00	1	0.29	0.6000
X1∗X3	4.50	324.00	1	5.81	0.0292
X1∗X4	−7.63	930.25	1	16.68	0.0010
X2∗X3	−1.75	49.00	1	0.88	0.3634
X2∗X4	−2.38	90.25	1	1.62	0.2226
X3∗X4	−0.38	2.25	1	0.040	0.8435
X1∗X1	−6.25	1050.11	1	18.83	0.0006
X2∗X2	−6.88	1272.96	1	22.83	0.0002
X3∗X3	−4.38	510.11	1	9.15	0.0085
X4∗X4	−7.13	1368.11	1	24.54	0.0002
Residual		836.33	15
Lack of fit		825.50	10	38.10	0.0004
Pure error		10.83	5
Cor total		6592.67	29

Std. Dev.: 7.47; R²: 89.31%; Mean: 39.67; Adj R²: 78.47%; C.V.%: 18.78; Pred R²: 67.64%; Adeq Precision: 8.76.