Table 3.

Analysis of variance (ANOVA) for β-galactosidase activity

Source	F value	p-value > F
Model	18.21	0.018
Speed agitation	1.92	0.259
Temperature	32.17	0.010
pH	60.04	0.004
X 1 X 2	5.83	0.094
X 1 X 3	3.22	0.170
X 2 X 3	6.07	0.090
Lack of fit	9.110	0.094

The model including as independent variables (X1) agitation, (X2) temperature and (X3) pH