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Coded values of the variables for the central composite design
| Actual values of coded levels | ||||||
|---|---|---|---|---|---|---|
|
Variables |
Coded symbol |
-1 |
0 |
1 |
-1.6818 |
1.6818 |
| -Inoculum age (h) |
X1 |
24 |
48 |
72 |
8.00 |
88 |
| Nitrogen content (mg) |
X2 |
200 |
300 |
400 |
132 |
468 |
| Substrate (g) | X3 | 1.5 | 2.0 | 2.5 | 1.16 | 2.84 |
