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

Table 3

Analysis of variance of the activated carbon yield, R/AC-H₃PO₄ (𝑌₁).

Source of variation	Sum of square	Degree of freedom	Square mean	Rapport	Signif.
Regression	1.43660𝐸+0003	5	2.87320𝐸+0002	62.2320	0.0150***
Residual	2.77015𝐸+0001	6	4.61692𝐸+0000
Total	1.46430𝐸+0003	11

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