Table 1: Correct answer at the different density gorillas.
| Gorilla density | Year | No | Yes | P-value |
| 50% density | 2 (total number of students: 25) | 23 (92%) | 2 (8%) | 0.671 |
| 4 (total number of students: 26) | 23 (88%) | 3 (12%) | ||
| 75% density | 2 (total number of students: 25) | 24 (96%) | 1 (4%) | 0.006 |
| 4 (total number of students: 26) | 17 (65%) | 9 (34%) | ||
| 100% density | 2 (total number of students: 25) | 24 (96%) | 1 (4%) | 0.006 |
| 4 (total number of students: 26) | 17 (65%) | 9 (34%) |