Parameter Optimisation of Carbon Nanotubes Synthesis via Hexane Decomposition over Minerals Generated from Anadara granosa Shells as the Catalyst Support

Table 3

Analysis of variance (ANOVA) for response surface quadratic model.

Source	SS	df	Mean sq.	F-value	Prob. > F	Remarks
Model	13925.84	9	1547.32	27.10	<0.0001	significant
A	454.38	1	454.38	7.96	0.0200	significant
B	1091.27	1	1091.27	19.11	0.0018	significant
C	900.07	1	900.07	15.76	0.0033	significant
A ^2	6049.78	1	6049.78	105.96	<0.0001	significant
B ^2	6490.59	1	6490.59	113.68	<0.0001	significant
C ^2	461.03	1	461.03	8.08	0.0194	significant
AB	6.020	1	6.020	0.11	0.7528
AC	20.16	1	20.16	0.35	0.5670
BC	1.80	1	1.80	0.03	0.8628

SS: sum of squares; df: degree of freedom; Mean sq.: mean square.