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Process variables and determined levels for central composite design.
| Variable | Symbol | Actual level | Coded value | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aeration rate (vvm) | X 1 | 0.16 | 0.30 | 0.65 | 1 | 1.14 | −1.41 | −1 | 0 | 1 | 1.41 |
| Agitation rate (rpm) | X 2 | 117.16 | 200 | 400 | 600 | 682.84 | −1.41 | −1 | 0 | 1 | 1.41 |
