[Retracted] Optimization of Remazol Black B Removal Using Biochar Produced from Caulerpa scalpelliformis Using Response Surface Methodology

Table 2

Analysis of variance for the removal of Remazol Black B.

Source	Degree of freedom	Seq SS	Adj MS	F
Regression	14	343.969	24.5692	29.48	<0.0001
Linear	4	302.918	2.4373	2.92	0.067
A	1	15.413	1.0898	1.31	0.275
B	1	199.267	5.2132	6.26	0.028
C	1	79.568	0.0177	0.02	0.886
D	1	8.670	1.9743	2.37	0.150
Square	4	32.051	8.0127	9.62	<0.001
A^2	1	8.263	0.5926	0.71	0.416
B^2	1	14.681	21.1559	25.39	<0.001
C^2	1	7.078	8.8981	10.68	0.007
D^2	1	2.028	2.0281	2.43	0.145
Interaction	6	9.000	1.5000	1.80	0.182
AC	1	9.000	9.0000	10.80	0.007
Residual error	12	10.000	0.8333
Lack of fit	10	10.000	1.0000
Pure error	2	0.000	0.0000
Total	26	353.969

R² = 0.9717; R²_adj = 0.9388.