| Boxplot statistics | |||||
| Variable | lower whisker | lower hinge | median | upper hinge | upper whisker |
| SK1 | 2 | 3 | 4 | 4 | 5 |
| SK2 | 4 | 4 | 4 | 4 | 4 |
| SK3 | 3 | 4 | 4 | 5 | 5 |
| SK4 | 2 | 3 | 4 | 4 | 5 |
| SK5 | 3 | 4 | 4 | 5 | 5 |
| SK6 | 3 | 4 | 4 | 5 | 5 |
| Boxplot Notches | |||
| Variable | lower bound | median | upper bound |
| SK1 | 3.87773592925961 | 4 | 4.12226407074039 |
| SK2 | 4 | 4 | 4 |
| SK3 | 3.87846153846154 | 4 | 4.12153846153846 |
| SK4 | 3.87773592925961 | 4 | 4.12226407074039 |
| SK5 | 3.8762448489019 | 4 | 4.1237551510981 |
| SK6 | 3.87810035352995 | 4 | 4.12189964647005 |
