Pineapple Bark Performance in Dyes Adsorption: Optimization by the Central Composite Design

Table 6

Estimated regression coefficients and their significance.

Coefficients	Estimated values	Standard deviation	value	value
b0	97.22	0.42	230.5	<0.0001
b1	1.83	0.2	85.95	<0.0001
b2	7.22	0.2	1338.61	<0.0001
b3	1.77	0.2	80.29	<0.0004
b11	−2.95	0.22	184.92	0.0847
b22	−3.35	0.22	238.34	0.0002
b33	−1.43	0.22	43.32	<0.0001
b12	0.52	0.26	4.03	<0.0001
b13	1.77	0.26	47.14	<0.0001
b23	−3.56	0.26	190.68	<0.0001