Optimization of Activated Carbons Prepared by H₃PO₄ and Steam Activation of Oil Palm Shells

Table 7

Analysis of variance of methylene blue adsorption, MB/AC-H₃PO₄ (𝑌₃).

Source of variation	Sum of squares	Degree of freedom	Mean square	Rapport	Signif.
Regression	1.2410𝐸+0005	5	2.48215𝐸+0004	2142.8652	<0.01***
Residual	3.8473𝐸+0003	6	6.4121𝐸+0002
Validity	3.8125𝐸+0003	3	1.270𝐸+0003	109.7139	0.130**
Error	3.4750𝐸+0001	3	1.1583𝐸+0001
Total	1.2795𝐸+0005	11

*** most significant effect, ** less significant effect, * not significant effect.