Table 5.
ANOVA statistical results of the response surface quadratic model for turbidity removal.
| Source | Sum of Squares | df | Mean Square | F-value | p-value | |
|---|---|---|---|---|---|---|
| Model (Quadratic) | 27.16 | 9 | 3.02 | 45.26 | <0.0001 | significant |
| A-PAC dosage | 2.98 | 1 | 2.98 | 44.64 | 0.0003 | |
| B-CPAM dosage | 2.1 | 1 | 2.1 | 31.51 | 0.0008 | |
| C-pH | 0.3784 | 1 | 0.3784 | 5.67 | 0.0487 | |
| AB | 14.14 | 1 | 14.14 | 211.99 | <0.0001 | |
| AC | 0.5041 | 1 | 0.5041 | 7.56 | 0.0285 | |
| BC | 0.09 | 1 | 0.09 | 1.35 | 0.2834 | |
| A2 | 2.27 | 1 | 2.27 | 34.06 | 0.0006 | |
| B2 | 1.39 | 1 | 1.39 | 20.84 | 0.0026 | |
| C2 | 3.65 | 1 | 3.65 | 54.67 | 0.0002 | |
| Residual | 0.4668 | 7 | 0.0667 | |||
| Lack of Fit | 0.2125 | 3 | 0.0708 | 1.11 | 0.4419 | not significant |
| Pure Error | 0.2543 | 4 | 0.0636 | |||
| Corrected Total Sum of Squares | 27.63 | 16 | ||||
| Coefficient of variance (CV, %) | 0.26 | |||||
| R2 | 0.9831 | |||||
| Adjusted R2 | 0.9614 | |||||
| Predicted R2 | 0.8626 | |||||
| Adequate precision | 26.53 |