Table 3 ANOVA for the reduced quadratic model of MB removal.
Source | Sum of squares | Degree of freedom | Mean square | F-value | p-value | |
|---|---|---|---|---|---|---|
Model | 454.21 | 8 | 56.78 | 44.07 | < 0.0001 | Significant |
A (pH) | 187.6 | 1 | 187.6 | 145.62 | < 0.0001 | |
B (Concentration) | 153.52 | 1 | 153.52 | 119.17 | < 0.0001 | |
C (Photocatalyst dosage) | 32.9 | 1 | 32.9 | 25.54 | < 0.0001 | |
D (Time) | 59.85 | 1 | 59.85 | 46.46 | < 0.0001 | |
AB | 0.03 | 1 | 0.03 | 0.023 | 0.8791 | |
BC | 1.27 | 1 | 1.27 | 0.98 | 0.3341 | |
BD | 2.33 | 1 | 2.33 | 1.81 | 0.1949 | |
A2 | 16.72 | 1 | 16.72 | 12.98 | 0.0019 | |
Residual | 24.48 | 19 | 1.29 | |||
Lack of fit | 21.01 | 16 | 1.31 | 1.14 | 0.5279 | Not significant |
Pure error | 3.47 | 3 | 1.16 | |||
Cor total | 478.69 | 27 | ||||
R2 | Adjusted R2 | Predicted R2 | Adeq Precision | Std. Dev. | Mean | C.V. % |
0.95 | 0.93 | 0.90 | 25.09 | 1.14 | 85.9 | 1.32 |
