Table 3.

Analysis of variance (ANOVA) and regression analysis of the quadratic model for inulinase production

Source*	ANOVA			Regression analysis
	Sum of squares	df	Probability > F	Coefficient estimate	Standard error	F value
Model/intercept	11203.13	9	< 0.0001	77.88	0.030	2.577E+005
A	28.73	1	< 0.0001	2.68	0.035	5947.87
B	233.93	1	< 0.0001	− 7.65	0.035	48432.39
C	2.25	1	< 0.0001	− 0.75	0.035	465.26
AB	4.06	1	< 0.0001	− 1.42	0.049	840.29
AC	39.03	1	< 0.0001	− 4.42	0.049	8079.95
BC	19.28	1	< 0.0001	3.10	0.049	3991.97
A2	6054.84	1	< 0.0001	− 28.02	0.025	1.254E+006
B2	3600.29	1	< 0.0001	− 21.60	0.025	7.454E+005
C2	1954.32	1	< 0.0001	− 15.92	0.025	4.046E+005
Residual	0.024	5
Lack of Fit	0.011	1	0.1457
Pure error	0.013	4
Cor total	11,203.15	14

*Symbols A, B and C are same as designated in Table 1