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Designing independent variables, three factors at three levels with coded and actual values.
| Factor levels | Coded values | Actual values | ||
|---|---|---|---|---|
| Stirring speed (X1) | Surfactant concentration (X2) | Polymer concentration (X3) | ||
| Low | −1 | 300 | 0.5 | 200 |
| Medium | 0 | 600 | 1 | 400 |
| High | +1 | 900 | 1.5 | 600 |
