Table 2.

Analysis of variance for the extraction of phenols yield (Y₁) and antioxidant capacity (Y₂).

	Source	Coefficient Estimate	Sum of Squares	Degree of Freedom	Standard Error	Mean Square	F-Value	p-Value
Y1	Model	7449.86	4.16 × 106	14	43.66	2.97 × 105	25.95	<0.0001 **
	X1	−251.16	1.51 × 106	1	21.83	1.51 × 106	132.36	<0.0001 **
	X2	−21.42	1.10 × 104	1	21.83	1.10 × 104	0.96	0.3422
	X3	32.15	2.48 × 104	1	21.83	2.48 × 104	2.17	0.1614
	X4	75	1.35 × 105	1	21.83	1.35 × 105	11.8	0.0037 **
	X1X2	75.34	9.08 × 104	1	26.74	9.08 × 104	7.94	0.0130 *
	X1X3	−8.22	1.08 × 103	1	26.74	1.08 × 103	0.09	0.7628
	X1X4	31.24	1.56 × 104	1	26.74	1.56 × 104	1.37	0.2609
	X2X3	−24.45	9.56 × 103	1	26.74	9.56 × 103	0.84	0.375
	X2X4	−56.51	5.11 × 104	1	26.74	5.11 × 104	4.47	0.0517
	X3X4	70.85	8.03 × 104	1	26.74	8.03 × 104	7.02	0.0182 *
	X12	−276.36	2.09 × 106	1	20.42	2.09 × 106	183.16	<0.0001 **
	X22	−87.83	2.12 × 105	1	20.42	2.12 × 105	18.5	0.0006 **
	X32	−91.63	2.30 × 105	1	20.42	2.30 × 105	20.14	0.0004 **
	X42	−43.54	5.20 × 104	1	20.42	5.20 × 104	4.55	0.05
	Residual		1.72 × 105	15		1.14 × 104
	Lack of Fit		1.09 × 105	10		1.09 × 104	0.87	0.6032
	Pure Error		6.26 × 104	5		1.25 × 104
	Cor Total		4.33 × 106	29
	R2	0.9604
	Adj R2	0.9233
	Pred R2	0.8341
	Adeq Precision	22.3775
	C.V. %	1.5169
	r	0.98
Y2	Model	72,589.38	1.57 × 109	14	608.6	1.12 × 108	50.34	<0.0001 **
	X1	−3487.37	2.92 × 108	1	304.3	2.92 × 108	131.34	<0.0001 **
	X2	−784.14	1.48 × 107	1	304.3	1.48 × 107	6.64	<0.0001 **
	X3	12.2	3.57 × 103	1	304.3	3.57 × 103	0	0.0210 *
	X4	1178.65	3.33 × 107	1	304.3	3.33 × 107	15	0.9685
	X1X2	−350.05	1.96 × 106	1	372.69	1.96 × 106	0.88	0.0015 **
	X1X3	939.3	1.41 × 107	1	372.69	1.41 × 107	6.35	0.3625
	X1X4	−450.04	3.24 × 106	1	372.69	3.24 × 106	1.46	0.0235 *
	X2X3	−786.65	9.90 × 106	1	372.69	9.90 × 106	4.46	0.2459
	X2X4	−2230.28	7.96 × 107	1	372.69	7.96 × 107	35.81	0.052
	X3X4	2062.14	6.80 × 107	1	372.69	6.80 × 107	30.62	<0.0001 **
	X12	−5682.69	8.86 × 108	1	284.65	8.86 × 108	398.56	<0.0001 **
	X22	−1573.68	6.79 × 107	1	284.65	6.79 × 107	30.56	<0.0001 **
	X32	−977.74	2.62 × 107	1	284.65	2.62 × 107	11.8	<0.0001 **
	X42	−3176.95	2.77 × 108	1	284.65	2.77 × 108	124.57	0.0037 **
	Residual		3.33 × 107	15		2.22 × 106		<0.0001 **
	Lack of Fit		2.71 × 107	10		2.71 × 106	2.18	0.2015
	Pure Error		6.22 × 106	5		1.24 × 106		0.2015
	Cor Total		1.60 × 109	29
	R2	0.9792
	Adj R2	0.9597
	Pred R2	0.8968
	Adeq Precision	28.1801
	C.V. %	2.3491
	r	0.9898

* 0.01 ≤ p < 0.05; ** p < 0.01.