Table 3.

ANOVA results of the central composite design for ethanol production

Source	SSa	DFb	F value	Prob > F
Model	246.52	9	49.12	<0.0001
A	32.94	1	59.07	<0.0001
B	27.25	1	48.87	<0.0001
C	7.48	1	13.42	0.0044
AB	0.000	1	0.000	1.000
AC	0.84	1	1.52	0.2456
BC	0.045	1	0.081	0.7821
A2	95.41	1	171.12	<0.0001
B2	42.86	1	76.87	<0.0001
C2	73.27	1	131.41	<0.0001
Residual	5.58	10
Lack of fit	4.64	5	4.97	0.0515
Pure error	0.93	5
Cor total	252.09	19

PRESS = 37.82, R ² = 0.9779 Adj R ² = 0.9580

Pred R ² = 0.8500