Table 2.
Experimental range and levels of independent variables.
| Factors | Range and levels (actual) | |
|---|---|---|
| Low | High | |
| A | 3 | 6 |
| B | 5 | 25 |
| C | 10 | 30 |
| D | 0 | 1 |
For D, 0 represents raw and 1 represents modified montmorillonite.
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