Table 2.
Analysis of variance (ANOVA) of the response surface quadratic model of the biosorption of Cu2+ ions onto R. damascena.
| Source | SS | df | MS | F value |
p value Prob > F |
|---|---|---|---|---|---|
| Model | 1423.4 | 4 | 355.8 | 10.26 | 0.0008* |
| Residual | 416.4 | 12 | 34.70 | – | – |
| Lack of fit | 321.4 | 8 | 40.18 | 1.69 | 0.321** |
| Pure error | 95.0 | 4 | 23.74 | – | – |
| Correlation total | 1839.8 | 16 | – | – | – |
| R2 = 0.87 | Adj. R2 = 0.80 | Pred. R2 = 0.70 | Adeq. precision = 9.8 | CV% = 8.83 | Mean = 59.92 |
Df degree of freedom, SS squares sum, MS mean sum of squares, CV Coefficient of variation.
*Significant at p ˂ 0.05.
**Not significant at p > 0.05.