Table 7.
Analysis of variance (ANOVA) for the response surface of full quadratic model for optimization of three variables (X1, glucose; X3, Cheese Whey; X5, corn steep liquor)
| Source | Sum of Square | Degree of freedom | Mean Square | F-value | P-value |
|---|---|---|---|---|---|
| X1 | 70.46 | 1 | 70.46 | 1182.44 | 0.0002 |
| X1 2 | 0.021 | 1 | 0.021 | 0.345 | 0.4098 |
| X3 | 10.19 | 1 | 10.19 | 171.07 | 0.0004 |
| X3 2 | 1.160 | 1 | 1.160 | 521.321 | 0.001601 |
| X5 | 34.60 | 1 | 34.60 | 580.57 | 0.00131 |
| X5 2 | 0.029 | 1 | 0.029 | 0.551 | 0.23481 |
| X1X3 | 23.78 | 1 | 23.78 | 399.10 | 0.0001 |
| X1X5 | 23.59 | 1 | 23.50 | 395.80 | 0.0035 |
| X3X5 | 20.52 | 1 | 20.52 | 344.37 | 0.0003 |
| Lack of fit | 0.01336 | 3 | 0.004112 | 2.001 | 0.311310 |
| Pure error | 0.061 | 2 | 0.056 | ||
| Total | 184.425 | 14 |
R2: 0.9955; Adjusted R2:0.9936