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

Table 4

Statistical estimations of coefficients: R/AC-H₃PO₄ (𝑌₁).

Name	Coefficient	F.Inflation	Ecart-type	𝑡. exp.	Signif. %
𝑏0	61.220		1.074	56.98	<0.01***
𝑏1	−2.642	1.00	0.760	−3.48	1.33*
𝑏2	−7.581	1.00	0.760	−9.98	0.0130***
𝑏11	−5.128	1.04	0.849	−6.04	0.117**
𝑏22	−11.348	1.04	0.849	−13.36	<0.01***
𝑏12	−3.253	1.00	1.074	−3.03	2.30*

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