Monitoring findings comparing overall volunteer-collected data (n = 707, convenience sample) to intern-collected data (n = 198, random sample), and tree-by-tree consistency for the trees observed by both field crews (n = 178). Blank entries were omitted from all summary data.
| Variable | Volunteer result | Intern result | Tree-by-tree consistency |
|---|---|---|---|
| Survival | 91% | 91% | 96% agreement |
| Crown vigor | 74% in classes 1 & 2 | 84% in classes 1 & 2 | volunteer vigor within 1 vigor class of interns for 90% of trees |
| Trunk circumference | n/a | n/a | 62% within 2.54 cm |
| Mulch | 40% good | 34% good | 55% agreement |