Table 7 Box–Behnken test regression model analysis of variance.
Source of variance | Sum of square | Degree of freedom | Mean square | F-value | P-value |
|---|---|---|---|---|---|
Model | 486.20 | 14 | 34.73 | 16.85 | < 0.0001** |
D | 0.12 | 1 | 0.12 | 0.06 | 0.8134 |
E | 8.25 | 1 | 8.25 | 4.00 | 0.0686* |
F | 8.38 | 1 | 8.38 | 4.07 | 0.0667* |
G | 81.85 | 1 | 81.85 | 39.70 | < 0.0001** |
DE | 41.22 | 1 | 41.22 | 19.99 | 0.0008** |
DF | 1.23 | 1 | 1.23 | 0.60 | 0.4544 |
DG | 0.67 | 1 | 0.67 | 0.33 | 0.5785 |
EF | 1.19 | 1 | 1.19 | 0.58 | 0.4624 |
EG | 63.44 | 1 | 63.44 | 30.77 | 0.0001** |
FG | 52.49 | 1 | 52.49 | 25.46 | 0.0003** |
D2 | 5.25 | 1 | 5.25 | 2.55 | 0.1364 |
E2 | 15.62 | 1 | 15.62 | 7.58 | 0.0175* |
F2 | 64.54 | 1 | 64.54 | 31.31 | 0.0001** |
G2 | 66.55 | 1 | 66.55 | 32.28 | 0.0001** |
Residual | 24.74 | 12 | 2.06 | – | – |
Lack of fit | 24.71 | 10 | 2.47 | 151.57 | 0.0065** |
Pure error | 0.033 | 2 | 0.016 | ||
Sum | 510.94 | 26 |
