Table 8.

Analysis of variance for viscosity response.

Source	DF	Sum of Squares	Mean of Squares	F-Value	p-Value
Model	9	132,377	14,709	26.49	0.010
Linear	3	102,978	34,326	61.83	0.003
X1	1	100,475	100,475	180.97	0.001
X2	1	1887	1887	3.40	0.162
X3	1	616	616	1.11	0.370
Square	3	25,294	8431	15.19	0.026
${\mathrm{X}}_{1 }^2$	1	18,463	18,463	33.25	0.010
${\mathrm{X}}_{2 }^2$	1	26	26	0.05	0.843
${\mathrm{X}}_{3 }^2$	1	2	2	0.00	0.954
2-Way Interaction	3	4105	1368	2.46	0.239
X1X2	1	3123	3123	5.62	0.098
X1X3	1	981	981	1.77	0.276
X2X3	1	1	1	0.0	0.973
Error	3	1666	555
Total	12	134,042