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

Table 6

Statistical estimations of coefficients: I₂/AC-H₃PO₄ (𝑌₂).

Name	Coefficient	F inflation	Ecart-type	𝑡. exp.	Signif. %
𝑏0	444.75		4.64	95.93	<0.01***
𝑏1	75.18	1.00	3.28	22.93	<0.01***
𝑏2	3.19	1.00	3.28	0.97	37.0
𝑏11	66.19	1.04	3.67	18.06	<0.01***
𝑏22	30.44	1.04	3.67	8.30	0.0281***
𝑏12	13.00	1.00	4.64	2.80	3.06*

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