Instructional topic occurrence in the individual syllabi of 68 collegiate arboriculture courses taught in the U.S. Syllabi were compiled in 2009 and comprise 41 courses from two-year programs and 27 courses from four-year programs.
| Statistic | All instructional topics (#/syllabus) | Major instructional topics (#/syllabus) | ||
|---|---|---|---|---|
| Four-year programs | Two-year programs | Four-year programs | Two-year programs | |
| Minimum value | 6 | 1 | 3 | 1 |
| Average | 19 | 17 | 10 | 10 |
| Standard deviation | 8 | 8 | 3 | 5 |
| Maximum value | 38 | 33 | 15 | 20 |
| P-value (HO: μ1 = μ2) | 0.2671 | 0.8132 | ||