Table 5.
Analysis of Variance (ANOVA) for Phenol response surface.
| Source | Sum of Squares | df | Mean Square | F-value | p-value | |
|---|---|---|---|---|---|---|
| Model | 1298.75 | 9 | 144.31 | 5.25 | <0.0001 | significant |
| A-Catalyst dosage | 5.25 | 1 | 5.25 | 0.1911 | 0.0413 | |
| B-Run Time | 85.43 | 1 | 85.43 | 3.11 | 0.043 | |
| C-Air Flow rate L/min | 315.28 | 1 | 315.28 | 11.48 | 0.0069 | |
| AB | 240.57 | 1 | 240.57 | 8.76 | 0.0143 | |
| AC | 554.24 | 1 | 554.24 | 20.18 | 0.0012 | |
| BC | 94.29 | 1 | 94.29 | 3.43 | 0.0036 | |
| A² | 0.7725 | 1 | 0.7725 | 0.0281 | 0.0072 | |
| B² | 1.74 | 1 | 1.74 | 0.0633 | 0.0065 | |
| C² | 4.65 | 1 | 4.65 | 0.1693 | 0.0894 | |
| Residual | 274.69 | 10 | 27.47 | |||
| Lack of Fit | 22.89 | 5 | 4.58 | 0.0909 | 0.9901 | not significant |
| Pure Error | 251.8 | 5 | 50.36 | |||
| Cor Total | 1573.44 | 19 | ||||
| R² 0.9854 | Model Precision 9.374 | |||||
| Adjusted R² 0.9683 | Std. Dev. | 5.24 | ||||
| Predicted R² 0.7567 | Mean | 47.86 | C.V.% | 10.95 | ||