Table 4.

ANOVA table for the phytase production from recombinant E. coli DH5α using face centered central composite design (FCCCD).

Source	DF	Sum of square	Mean square	F-value	P-value
Regression	10	40588723	4058872	31.49	0.000*
Linear	5	28778185	5755637	44.65	0.000*
Square	2	1847046	923523	7.16	0.004*
Interaction	3	9963492	3321164	25.76	0.000*
Residual error	21	2707151	128912
Lack-of-fit	16	2435183	152199	2.80	0.130
Pure error	5	271968	54394
Total	31	271968

Notes: Coefficient of determination, R² = 0.938, R² (adjusted) = 0.908.

^*P-value < 0.05.

Abbreviation: DF, degree of freedom.