Table 3.

ANOVA for the quadratic models of ethanol concentration and productivity

Sources of variance	Ethanol concentration			Ethanol productivity
	Sum of square	F value	p value	Sum of square	F value	p value
Model	9885.36	226.42	< 0.0001	16.47	69.87	0.0001
Temperature—X1	6818.78	1405.66	< 0.0001	11.28	430.61	< 0.0001
Yeast conc.—X2	0.30	0.06	0.8122	0.00	0.17	0.6953
pH—X3	13.73	2.83	0.1533	0.09	3.45	0.1225
X1X2	11.39	2.33	0.1876	0.13	4.81	0.0798
X1X3	1.39	0.28	0.6151	0.03	1.04	0.3548
X3X4	5.86	1.21	0.3219	0.02	0.86	0.3966
X12	2985.41	615.43	< 0.0001	4.81	183.70	< 0.0001
X22	1.47	0.30	0.6062	0.01	0.27	0.6225
X32	5.14	1.06	0.3505	0.02	0.92	0.3813
Lack of fit	20.87	4.12	0.2016	0.12	5.37	0.1610
R2	0.9976			0.9921
CV	3.92			3.85