Question: In a chemical process development study on yield, four factors are studied, each at two levels, Time (A), concentration (B), pressure (C) and temperature (D),
In a chemical process development study on yield, four factors are studied, each at two levels, Time (A), concentration (B), pressure (C) and temperature (D), the yield of this process (pounds/minute) are measured, and the following table gives the results:
| A | B | C | D | Yield |
| -1 | -1 | -1 | -1 | 12 |
| 1 | -1 | -1 | -1 | 18 |
| -1 | 1 | -1 | -1 | 13 |
| 1 | 1 | -1 | -1 | 16 |
| -1 | -1 | 1 | -1 | 17 |
| 1 | -1 | 1 | -1 | 15 |
| -1 | 1 | 1 | -1 | 20 |
| 1 | 1 | 1 | -1 | 15 |
| -1 | -1 | -1 | 1 | 10 |
| 1 | -1 | -1 | 1 | 25 |
| -1 | 1 | -1 | 1 | 13 |
| 1 | 1 | -1 | 1 | 24 |
| -1 | -1 | 1 | 1 | 19 |
| 1 | -1 | 1 | 1 | 21 |
| -1 | 1 | 1 | 1 | 17 |
| 1 | 1 | 1 | 1 | 23 |
- Identify significant factors and interactions that influence the yield
- Plot relevant main effects and interaction charts to illustrate how they affect the yield
- Write down regression model relating yield to the important process variables
- Identify optimal factor levels to maximize the yield
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