Table 7.
Independent variable codes and levels in experimental design.
| Code |
X1: Temperature (°C) |
X2: Ethanol Concentration (%) |
X3: Time (min) |
X4: Liquid-to-solid Ratio (mL/g) |
|---|---|---|---|---|
| −1 | 40 | 80 | 30 | 25:1 |
| 0 | 50 | 85 | 35 | 35:1 |
| +1 | 60 | 90 | 40 | 45:1 |
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