Table 4.

Analysis of variance for Eq. 3 (R² = 0.8190)

Source	Sum of square	df	Mean square	F-value	p-value prob>F	Remark
Model	20.98	14	1.50	4.85	0.0022	S
Lack of Fit	4.63	10	0.46	965.03	0.2301	NS
Error	4.63	15	0.31
Pure error	0.0024	5	0.00048
Total	25.61	29

S Significant; NS non-significant at 5% level