Table 3 ANOVA analysis for responses Y[CHA(mg/L)]
| Source | Sum of squares | Degree of freedom | Mean square | F value | Prob > F | R 2 |
|---|---|---|---|---|---|---|
| Model | 506.99 | 9 | 56.33 | 13.64 | 0.0002 | 0.9247 |
| Residual | 41.29 | 10 | 4.13 | – | – | – |
| Lack of fit | 38.48 | 5 | 7.7 | 13.66 | 0.0061 | – |
| Pure error | 2.82 | 5 | 0.56 | – | – | – |