Table 6.

Actual and predicted values of final ethanol concentration based on a two-level fractional factorial design

Runs	KCl	MgSO4	ZnSO4	CaCl2	CuSO4	FeSO4	CoCl2	MnCl2	Ethanol concentration (g/L)		Residual
									Observed	Predicted
1	0.5	2.5	0.09	0.8	0.025	0.01	0.03	0.001	78.91	78.08	0.84
2	0.5	2.5	0.01	0.8	0.125	0.09	0.001	0.001	65.72	65.28	0.45
3	0.1	2.5	0.09	0.8	0.125	0.01	0.001	0.02	70.19	71.11	− 0.92
4	0.1	7.5	0.09	0.8	0.025	0.09	0.001	0.001	82.26	83.54	− 1.28
5	0.5	7.5	0.09	0.2	0.125	0.01	0.001	0.001	66.34	66.70	− 0.36
6	0.1	7.5	0.01	0.2	0.125	0.09	0.001	0.02	75.00	74.17	0.84
7	0.5	7.5	0.01	0.2	0.025	0.09	0.03	0.001	72.67	73.59	− 0.92
8	0.5	7.5	0.09	0.8	0.125	0.09	0.03	0.02	65.55	64.35	1.20
9	0.5	2.5	0.09	0.2	0.025	0.09	0.001	0.02	78.38	78.37	0.00
10	0.5	2.5	0.01	0.2	0.125	0.01	0.03	0.02	69.71	70.99	− 1.28
11	0.1	2.5	0.09	0.2	0.125	0.09	0.03	0.001	74.44	74.37	0.07
12	0.1	7.5	0.09	0.2	0.025	0.01	0.03	0.02	81.54	81.10	0.44
13	0.1	2.5	0.01	0.2	0.025	0.01	0.001	0.001	83.83	82.63	1.20
14	0.5	7.5	0.01	0.8	0.025	0.01	0.001	0.02	78.54	78.47	0.07
15	0.1	7.5	0.01	0.8	0.125	0.01	0.03	0.001	82.02	82.01	0.00
16	0.1	2.5	0.01	0.8	0.025	0.09	0.03	0.02	71.79	72.14	− 0.36
Control	0	0	0	0	0	0	0	0	78.04