Table 6.
Coefficients of the fitted model *.
| Predictor | Regression Coefficient | Standard Error | t−Value, df ** = 9 |
p–Value *** | −95% Confidence Interval |
+95% Confidence Interval |
|---|---|---|---|---|---|---|
| Intercept | 52.71329 | 10.26366 | 5.13592 | 0.00061 | 29.49528 | 75.93130 |
| pH (L) | −10.21092 | 2.06685 | −4.94032 | 0.00080 | −14.88646 | −5.53537 |
| pH (Q) | 0.52547 | 0.11471 | 4.58105 | 0.00133 | 0.26599 | 0.78495 |
| Na2CS3 (L) | −0.00910 | 0.00922 | −0.98623 | 0.34979 | −0.02997 | 0.01177 |
| Na2CS3 (Q) | 0.00001 | 0.00001 | 0.74361 | 0.47608 | −0.00002 | 0.00003 |
| Time (L) | −0.03449 | 0.04684 | −0.73627 | 0.48032 | −0.14046 | 0.07148 |
| Time (Q) | 0.00076 | 0.00115 | 0.66655 | 0.52178 | −0.00183 | 0.00336 |
* represent the fifth decimal place; ** df—degree of freedom; *** statistically significant if p < 0.05.