Table 3. ANOVA analysis of TSB medium and extracted pineapple peel juice (EPPJ) effects on PHAs production after fitting with response surface quadratic model.
| Source | Coefficient | Sum of squares | df | Mean square | F-value | p-value Prob>F |
|---|---|---|---|---|---|---|
| Model | 35.28 | 5 | 7.06 | 40.18 | < 0.0001 | |
| xi-TSB medium | 0.028 | 0.006 | 1 | 0.006 | 0.037 | 0.8535 |
| xj-EPPJ | -0.35 | 0.98 | 1 | 0.98 | 5.61 | 0.0497 |
| xixj | -0.72 | 2.07 | 1 | 2.07 | 11.81 | 0.0109 |
| xi2 | -1.78 | 22.05 | 1 | 22.05 | 125.59 | < 0.0001 |
| xj2 | -1.43 | 14.24 | 1 | 14.24 | 81.07 | < 0.0001 |
| Residual | 1.23 | 7 | 0.17 | |||
| Lack of Fit | 1.01 | 3 | 0.34 | 6.13 | 0.0561 | |
| Pure Error | 0.22 | 4 | 0.055 | |||
| Cor Total | 36.51 | 12 |
Standard deviation = 0.42; mean = 2.20; coefficient of variance (C.V. %) = 19.05; PRESS = 7.52; R-squared = 0.9663;
Adj R-squared = 0.9423; Pred R-squared = 0.7939; Adeq Precision = 14.941