Assessing Breeding Populations of Ducks by Ground Counts
Table 14
Table 14. Analysis of variation of dabbler counts taken at three different time intervals, 0800, 1300, and 1800 hours, on 3 days. Data from Table 13
| Source of variation | Degrees of freedom | Sum of squares | Mean square | F Value |
| Mallard | ||||
| Total | 8 | 2485 | ||
| Time | 2 | 1064 | 532 | |
| Error | 6 | 1421 | 236.8 | 2.25* |
| Pintail | ||||
| Total | 8 | 744 | ||
| Time | 2 | 408 | 204 | |
| Error | 6 | 336 | 56.0 | 3.64* |
| Widgeon | ||||
| Total | 8 | 703 | ||
| Time | 2 | 412 | 206 | |
| Error | 6 | 291 | 48.5 | 4.24* |
| Shoveler | ||||
| Total | 8 | 290 | ||
| Time | 2 | 241 | 20.5 | |
| Error | 6 | 49 | 8.2 | 14.75^ |
| Gadwall | ||||
| Total | 8 | 180 | ||
| Time | 2 | 144 | 72 | |
| Error | 6 | 36 | 6.0 | 12.00^ |
| Blue-winged teal | ||||
| Total | 8 | 1080 | ||
| Time | 2 | 548 | 274 | |
| Error | 6 | 532 | 88.7 | 3.09* |
| For 2 and 6 d.f. F05 = 5.14, F01 = 10.92. *The null hypothesis that no significant difference exists between time means of different time periods is accepted at .05 level. ^The null hypothesis that no significant difference exists between time means of different time periods is rejected at .01 level. |
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