Table 4.
Factorial plan with 2 levels and 3 factors as independent variables.
| Factor | Variable | Level | |
|---|---|---|---|
| Low (−1) | High (+1) | ||
| X1 | Oleic acid (%) | 5 | 10 |
| X2 | Tween 20 (%) | 30 | 40 |
| X3 | PEG 400 (%) | 10 | 20 |
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