Table 1.
Process variables and their levels of experimental design
| Symbols | Independent variable | Range and levels | ||
|---|---|---|---|---|
| −1 | 0 | +1 | ||
| A | Salt (%) | 2 | 2.5 | 3 |
| B | Lactose (%) | 1 | 1.5 | 2 |
| C | Magnesium sulphate + Manganese sulphate (%) | 1 | 1.5 | 2 |
| D | Mustard (%) | 1 | 1.5 | 2 |
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