Response Surface Methodology Process Optimization of Biodiesel Production from Castor Seed Oil

Table 6

Analysis of variance for the yield of biodiesel from castor seed oil.

Source	Sum of square	Degree of freedom	Mean square	F value	Prob > F	Remark
Model	3625.72	14	258.98	26.48	<0.0001	Significant
X1	225.03	1	225.03	23.01	0.0002
X2	249.81	1	249.81	25.54	0.0001
X3	442.47	1	442.47	45.23	<0.0001
X4	1271.82	1	1271.82	130.02	<0.0001
X1X2	3.47	1	3.47	0.35	0.5604
X1X3	12.27	1	12.27	1.25	0.2804
X1X4	10.61	1	10.61	1.08	0.3141
X2X3	104.19	1	104.19	10.65	0.0052
X2X4	41.44	1	41.44	4.24	0.0574
X3X4	77.22	1	77.22	7.89	0.0132
	283.93	1	283.93	29.03	<0.0001
	369.16	1	369.16	37.74	<0.0001
	3.45	1	3.45	0.35	0.5612
	799.42	1	799.42	81.72	<0.0001
Residual	146.73	15	9.78
Lack of fit	145.68	10	14.57	69.68	<0.0001	Significant
Pure error	1.05	5	0.21
Correlation total	3772.45	29