Table 4.
Analysis of mean differences and confidence intervals for E. coli levels in the wet season (test value = 6; the mean difference is significant at P ≤ 0.05).
| Water sources | T | df | Sis (2-tailed) | Mean difference | 95% confidence interval | |
|---|---|---|---|---|---|---|
| Upper limit | Lower limit | |||||
| Bore hole | 3.742 | 7 | 0.007 | 1.000 | 0.37 | 1.63 |
| Canal | 2.292 | 2 | 0.149 | 59.667 | −52.32 | 171.66 |
| Dam | 7.814 | 14 | 0.001 | 39.867 | 28.92 | 50.81 |
| Hand-dug well | 5.358 | 14 | 0.001 | 1.467 | 0.88 | 2.05 |
| River | 2.982 | 2 | 0.096 | 4.333 | −1.92 | 10.58 |
| Stream | 7.745 | 16 | 0.001 | 20.765 | 15.08 | 26.45 |