Table 6.
ANOVA table for quadratic model after model reduction.
| Source | Sum of Squares | df | Mean Square | F-Value | Prob. > F | Status |
|---|---|---|---|---|---|---|
| Model | 279.672 | 8 | 34.95902 | 16.32379 | <0.0001 | Significant |
| A-Flow rate | 5.55177 | 1 | 5.551778 | 2.592352 | 0.1297 | - |
| B-Voltage | 13.6666 | 1 | 13.66606 | 6.381241 | 0.0242 | Significant |
| C-Maghemite% | 0.13369 | 1 | 0.133696 | 0.062428 | 0.8063 | - |
| D-Concentration | 3.29399 | 1 | 3.293995 | 1.5381 | 0.2353 | - |
| A^2 | 56.6745 | 1 | 56.67451 | 26.46364 | 0.0001 | Significant |
| B^2 | 17.2337 | 1 | 17.23371 | 8.047122 | 0.0132 | Significant |
| C^2 | 26.2403 | 1 | 26.2403 | 12.25267 | 0.0035 | Significant |
| D^2 | 229.459 | 1 | 229.4592 | 107.1439 | <0.0001 | Significant |
| Residual | 29.9823 | 14 | 2.141599 | - | - | - |
| Lack of Fit | 29.1866 | 13 | 2.245129 | 2.821554 | 0.4382 | not significant |
| Pure Error | 0.7957 | 1 | 0.795707 | - | - | - |
| Cor. Total | 309.654 | 22 | - | - | - | - |
| Std. Dev. | 1.46342 | R-Squared | 0.9031 | - | - | |
| Mean | 29.2768 | Adj R-Squared | 0.8478 | - | - | |
| C.V. % | 4.99855 | Pred R-Squared | 0.6448 | - | - | |
| PRESS | 109.960 | Adeq Precision | 13.756 | - | - | |