Table 1.
The range of the independent variables and their corresponding levels
| Independent variables | Symbol | Coded levels | ||
|---|---|---|---|---|
| + 1 | 0 | − 1 | ||
| Feed moisture (%) | X1 | 45 | 40 | 35 |
| Screw speed (rpm) | X3 | 200 | 180 | 160 |
| Extrusion temperature ( °C) | X2 | 95 | 85 | 75 |
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.