Table 6 Regression coefficients and significance of response surface quadratic
Term | Effect | Coefficient | Standard Error Coefficient | 95% CI Low | 95% CI High | P-Value | T-Value | VIF |
|---|---|---|---|---|---|---|---|---|
Constant | - | 27.385 | 0.1330 | 27.083 | 27.686 | 0.000 | 205.54 | - |
X1 | 12.000 | 6.000 | 0.0981 | 5.7782 | 6.2218 | 0.000 | 61.19 | 1.00 |
X3 | 0.000 | 0.000 | 0.0981 | -0.2218 | 0.2218 | 1.000 | 0.00 | 1.00 |
X12 | 11.154 | 5.577 | 0.1440 | 5.251 | 5.902 | 0.000 | 38.75 | 1.01 |
X32 | -0.846 | -0.423 | 0.1440 | -0.749 | -0.098 | 0.016 | -2.94 | 1.01 |
X1X3 | -11.000 | -5.500 | 0.1390 | -5.814 | -5.186 | 0.000 | -39.66 | 1.00 |