Sampling distribution summary data: average age since planting and average tree lawn widths by genus for four tree genera planted in Cincinnati, Ohio, since 1980.
| Genus | Average observed | Time since planting (yrs) | Tree lawn width, m (ft) |
|---|---|---|---|
| Gleditsia | 176 | 11 | 1.6 (5.3) |
| Koelreuteria | 93 | 11 | 1.4 (4.6) |
| Quercus | 181 | 10 | 2.3 (7.4) |
| Zelkova | 161 | 9 | 2.1 (6.8) |
| Totals | 611 | — | — |
| Mean | 153 | 10.1 | 2.0 (6.5) |
| Median | — | 9.0 | 1.9 (6.2) |
| Std. dev. | — | 3.6 | 0.5 (1.8) |