Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Experimental range and level of the independent variables
| Variable | Parameter | Range and level | ||||
|---|---|---|---|---|---|---|
| -1.682 | -1 | 0 | 1 | 1.682 | ||
| X1 | Glycerol (g/L) | 1.0 | 3.0 | 5.0 | 7.0 | 9.0 |
| X2 | Soytone (g/L) | 5.0 | 9.0 | 15.0 | 21.0 | 25.0 |
| X3 | Minerals (g/L) | 3.0 | 4.2 | 6.2 | 8.2 | 9.4 |
xi = coded value of the variable Xi.
x1 = (Glucose - 5)/2; x2 = (Peptone - 15)/6; x3 = (Minerals - 6.2)/2.
