Table 4.
Comparisons of the estimated mean stem diameter 
and its 95% confidence interval for the systematic sample populations of the most common maple species to the true mean stem diameter (μ) of the survey populations.
| Species | Pop. size N | est. mean X | 95% confidence interval | true mean μ |
|---|---|---|---|---|
| Rochester | ||||
| Norway maple | 305 | 16.95 | 16.22-17.68 | 17.22 |
| Silver maple | 295 | 26.52 | 25.79-27.25 | 26.55 |
| Syracuse | ||||
| Norway maple | 160 | 16.96 | 16.18-17.74 | 17.21 |
| Sugar maple | 167 | 20.25 | 19.29-21.21 | 20.85 |
| Silver maple | 138 | 25.51 | 24.15-26.87 | 24.44 |