Table 4.

ANOVA of the fitted quadratic polynomial model for the extraction yield of QU.

Source	Sum of squares	Degrees of freedom (df)	Mean squares	F value	P value	Remarks
Model	0.034	9	0.037	51.13	<0.0001	Significant
X 1	0.012	1	0.012	158.99	<0.0001	Significant
X 2	3.312 × 10−3	1	3.312 × 10−3	45.26	<0.0001	Significant
X 3	9.458 × 10−4	1	9.458 × 10−4	12.92	0.0049
X 1 X 2	3.314 × 10−4	1	3.314 × 10−4	4.53	0.0592
X 1 X 3	6.561 × 10−5	1	6.561 × 10−5	0.90	0.3660
X 2 X 3	5.246 × 10−5	1	5.246 × 10−5	0.72	0.4170
X 1 2	9.950 × 10−3	1	9.950 × 10−3	135.98	<0.0001	Significant
X 2 2	8.527 × 10−3	1	8.527 × 10−3	116.53	<0.0001	Significant
X 3 2	1.588 × 10−3	1	1.588 × 10−3	21.70	0.0009
Residual	7.317 × 10−4	10	7.317 × 10−5
Lack of fit	5.213 × 10−4	5	1.043 × 10−4	2.48	0.1711	Not significant
Pure error	2.105 × 10−4	5	4.209 × 10−5
Cor. total	0.034	19