Analysis of variables for regression model of response under extraction conditions^a.

Source	Coefficient estimate	Sum of squares	DF	Mean square	F value	P value	Significance
Model	3.63	2.65	9	0.29	71.63	<0.0001	***<0.001
X 1	0.09	0.065	1	0.065	15.79	0.0106	*<0.05
X 2	−0.18	0.25	1	0.25	59.71	0.0006	***<0.001
X 3	0.17	0.22	1	0.22	54.70	0.0007	***<0.001
X 1 X 2	−0.30	0.36	1	0.36	87.73	0.0002	***<0.001
X 1 X 3	−0.14	0.078	1	0.078	19.11	0.0072	**<0.01
X 2 X 3	−0.09	0.032	1	0.032	7.90	0.0375	*<0.05
X 1 2	−0.37	0.50	1	0.50	122.63	0.0001	***<0.001
X 2 2	−0.50	0.94	1	0.94	228.72	<0.0001	***<0.001
X 3 2	−0.34	0.44	1	0.44	106.59	0.0001	***<0.001
Residual		0.021	5	4.10 × 10–3
Lack of fit		0.017	3	5.68 × 10−3	3.28	0.2424	>0.05
Pure error		3.47 × 10−3	2	1.73 × 10−3
Col total		2.67	14
R 2 = 0.9923 Radj2 = 0.9785 C.V. = 2.15 adeq. precision = 24.059

^aNotes: * significant at 0.05 level; ** significant at 0.01 level; *** significant at 0.001 level.