Table 7 Statistical test results of the multiple regression model having values measured by the oxidimetry method as response variables, values measured by the electrochemical method, values measured by the DO meter (mg/L), water temperature (degree Celsius), and the interaction between the electrochemical method and DO as explanatory variables
| Â | Â | Type III | Â | Â | Â |
|---|---|---|---|---|---|
Source | Degree of freedom | Sum of squares | Mean sum of squares | F ratio | p value |
Electrochemical method | 1 | 2.5041 | 2.5041 | 12891.5 | < 0.0001 |
DO meter (mg/L) | 1 | 0.0018 | 0.0018 | 9.18 | 0.0060 |
Water temperature (degree Celsius) | 1 | 0.0003 | 0.0003 | 1.67 | 0.2088 |
Interaction between electrochemical method and DO | 1 | 0.0014 | 0.0014 | 7.46 | 0.0119 |