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Coded and real values of independent variables used in the central composite design.
| Independent variables (g/l) | Actual levels of coded values | ||||
|---|---|---|---|---|---|
|
| |||||
| -α | -1 | 0 | 1 | α | |
| Maltose (X1) | 8.18 | 15 | 25 | 35 | 41.8 |
| Yeast extract (X2) | 8.18 | 15 | 25 | 35 | 41.8 |
| Soytone (X3) | 4.77 | 15 | 30 | 45 | 55.2 |
