Table 4.
ANOVA results for Cd removal using a quadratic model from CCD.
| Source | Sum of squares | df | Mean square | F-value | p-value | |
|---|---|---|---|---|---|---|
| Model | 1685.60 | 14 | 120.40 | 124.57 | < 0.0001 | Significant |
| A | 205.92 | 1 | 205.92 | 213.06 | < 0.0001 | |
| B | 843.72 | 1 | 843.72 | 872.96 | < 0.0001 | |
| C | 25.83 | 1 | 25.83 | 26.73 | 0.0001 | |
| D | 7.59 | 1 | 7.59 | 7.86 | 0.0134 | |
| AB | 8.85 | 1 | 8.85 | 9.16 | 0.0085 | |
| AC | 6.38 | 1 | 6.38 | 6.60 | 0.0214 | |
| AD | 0.1406 | 1 | 0.1406 | 0.1455 | 0.7082 | |
| BC | 4.52 | 1 | 4.52 | 4.67 | 0.0472 | |
| BD | 5.64 | 1 | 5.64 | 5.84 | 0.0289 | |
| CD | 0.3906 | 1 | 0.3906 | 0.4042 | 0.5345 | |
| A2 | 388.08 | 1 | 388.08 | 401.53 | < 0.0001 | |
| B2 | 236.51 | 1 | 236.51 | 244.71 | < 0.0001 | |
| C2 | 90.00 | 1 | 90.00 | 93.12 | < 0.0001 | |
| D2 | 30.90 | 1 | 30.90 | 31.97 | < 0.0001 | |
| Residual | 14.50 | 15 | 0.9665 | |||
| Lack of fit | 12.62 | 10 | 1.26 | 3.37 | 0.0963 | Not significant |
| Pure error | 1.88 | 5 | 0.3750 | |||
| Cor total | 1700.10 | 29 |