Table 5.
Analysis of variance for the quadratic polynomial model of lipid content produced by Cunninghamella bainieri 2A1.
| Source | Polynomial coefficients | Sum of squares | DF | Mean square | F value | Prob > F |
|---|---|---|---|---|---|---|
| Model | 300.21 | 5 | 60.4 | 13.84 | 0.0016* | |
| Intercept | 37.75 | 1 | ||||
| X 1 | 1.41 | 15.83 | 1 | 15.83 | 3.65 | 0.0978 |
| X 2 | 3.80 | 115.74 | 1 | 115.74 | 26.68 | 0.0013* |
| X 1 2 | −1.161 | 9.30 | 1 | 9.30 | 2.14 | 0.1865 |
| X 2 2 | −3.86 | 103.86 | 1 | 103.86 | 23.94 | 0.0018* |
| X 1 X 2 | −3.93 | 61.78 | 1 | 61.78 | 14.24 | 0.0070* |
| Residual | 30.37 | 7 | 4.34 | |||
| Lack of fit | 22.46 | 3 | 7.49 | 3.79 | 0.1156 | |
| Pure error | 7.91 | 4 | 1.98 |
*Statistically significant at 99% probability level.
X 1: aeration rate (vvm); X 2: agitation rate (rpm); X 1 2 and X 2 2: the quadratic terms; X 1 X 2: the interaction term.
R 2 = 0.9081.