Table I.
Coded Levels of Factorial Design
| Factor | Levels used | ||
|---|---|---|---|
| Low (−1) | Medium (0) | High (+1) | |
| Amount of calcium carbonate (mg) (X 1) | 70 | 80 | 90 |
| Amount of gum base (mg) (X 2) | 450 | 500 | 550 |
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