Copper-Doped Zinc Oxide Nanoparticles: Synthesis, Characterization, and Application for Adsorptive Removal of Toxic Azo Dye

Table 3

ANOVA for the quadratic model.

Source	Sum of squares	df	Mean square	F value	value
Model	2040.47	14	145.75	71.69	<0.0001	Significant
A-time	2.48	1	2.48	1.22	0.2865
B-dosage	0.2904	1	0.2904	0.1429	0.7108
C-pH	0.0150	1	0.0150	0.0074	0.9327
D-concentration	1.03	1	1.03	0.5042	0.4885
AB	6.55	1	6.55	3.22	0.0927
AC	369.02	1	369.02	181.53	<0.0001
AD	56.25	1	56.25	27.67	<0.0001
BC	25.30	1	25.30	12.45	0.0030
BD	13.84	1	13.84	6.81	0.0197
CD	3.50	1	3.50	1.72	0.2094
A^2	574.62	1	574.62	282.66	<0.0001
B^2	863.11	1	863.11	424.57	<0.0001
C^2	348.51	1	348.51	171.44	<0.0001
D^2	399.11	1	399.11	196.33	<0.0001
Residual	30.49	15	2.03
Lack of fit	24.44	10	2.44	2.02	0.2268	Not significant
Pure error	6.05	5	1.21
Cor total	2070.97	29