Table 7.
Calculated linear (L) and quadratic (Q) coefficients of the fitted model by Statistica 13.
| Parameter | Regression Coefficients, R2 = 0.9173, R2adj = 0.8622, 3 Parameter, 1 Block, 16 Experiments, MS = 0.0320 | |||||
|---|---|---|---|---|---|---|
| Regression Coefficient |
*** SE | t-Value **** df = 9 |
95% Confidence Interval Lower Limit |
95% Confidence Interval Upper Limit |
***** p-Value | |
| Intercept | 34.707 | 7.592 | 4.572 | 17.533 | 51.881 | 0.001344 |
| pH (L) * | −5.890 | 1.177 | −5.004 | −8.552 | −3.227 | 0.000735 |
| pH (Q) ** | 0.274 | 0.059 | 4.668 | 0.141 | 0.408 | 0.001171 |
| V Na2CS3 (L) | −129.512 | 164.921 | −0.785 | −502.589 | 243.564 | 0.452454 |
| V Na2CS3 (Q) | 1504.599 | 2351.944 | 0.640 | −3815.868 | 6825.066 | 0.538292 |
| Time (L) | −0.031 | 0.048 | −0.642 | −0.139 | 0.078 | 0.536893 |
| Time (Q) | 0.001 | 0.002 | 0.580 | −0.004 | 0.007 | 0.576406 |
* L—linear effect, ** Q—quadratic effect, *** SE—standard error, **** df—degree of freedom, ***** statistically significant if p < 0.05.