Table 4.

Variance analysis of regression model.

Source	Sum of squares	df	Mean square	F-value	p-value	Significance
Model	6.29 × 10−4	9	6.99 × 10−5	12.54	0.0062	**
Lack of fit	1.77 × 10−5	3	5.90 × 10−6	1.16	0.49
Pure error	1.02 × 10−5	2	5.08 × 10−6	-	-	-
Cor total	6.57 × 10−4	14	-	-	-	-

^**Values of “Prob > F” less than 0.05 indicate model terms are significant.