Activated Carbon from Prickly Pear Seed Cake: Optimization of Preparation Conditions Using Experimental Design and Its Application in Dye Removal

Table 3

Estimated values of coefficients for response Y.

No.	Coefficient	Significance (%)
b0	160.467	0.0118
b1	46.33	0.0438
b2	13.99	0.469
b3	−45.30	0.0454
b11	53.51	0.0972
b22	−45.01	0.137
b33	−13.26	1.90
b12	61.83	0.116
b13	−11.13	6.4
b23	−6.33	17.1

Statistically significant at the <99.99% level. Statistically significant at the 99% level. Statistically significant at the 95% level.