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Kruskal - Wallis test results for observed groundwater depths vs. Predicted GWPZ Classes.
| GWPZ class | Mean rank | Median depth (m bgl) | No. of wells |
|---|---|---|---|
| Very good | 85.3 | 17.8 | 15 |
| Good | 118.7 | 21.6 | 60 |
| Moderate | 179.2 | 28.7 | 110 |
| Poor | 231.5 | 33.1 | 115 |
| Very poor | 294.6 | 41.8 | 50 |
| Test statistic (H) | 42.87 | ||
| Degrees of freedom (df) | 4 | ||
| p-value | < 0.001 |
