Table 2. Analysis of variance (ANOVA) of the response variables

Source	Sum of squares	Degree of freedom	Mean square	F-value	p-value
Viscosity
Model	1.137E+006	9	1.263E+005	61.12	<0.0001
Residual	20668.81	10	2066.88
Lack of fit	20668.81	5	4133.76
Pure error	0.000	5	0.000
Total	1.158E+006	19
R2=0.9821
pH
Model	0.21	13	0.016	11.96	<0.0030
Residual	8.250E-003	6	1.375E-003
Lack of fit	8.250E-003	1	482.55	8.250E-003
Pure error	0.000	5	0.000
Total	0.22	19
R2=0.9628
Sedimentation
Model	0.31	13	0.024	10.31	0.0045
Residual	0.014	6	2.324E-003
Lack of fit	0.014	1	0.014
Pure error	0.000	5	0.000
Total	0.33	19
R2=0.9571
Total solids
Model	28.42	9	3.16	10.39	0.0005
Residual	3.04	10	0.30
Lack of fit	3.04	5	0.61
Pure error	0.000	5	0.000
Total	31.45	19
R2=0.9034
Overall acceptability
Model	0.49	13	0.038	7.05	0.0124
Residual	0.032	6	5.351E-003
Lack of fit	0.032	1	0.032
Pure error	0.000	5	0.000
Total	0.52	19
R2=0.9385