A researcher investigated whether high-intensity interval training (HIIT) or moderate-intensity continuous training (MICT) results in different subjective energy levels post-workout. An independent measures design was used. Group 1 performed a 20-minute HIIT session, while Group 2 performed a 20-minute MICT session. Immediately after the workout, participants rated their physical energy level on a scale from 1 ('completely drained') to 20 ('fully energised').
| Ratings of post-workout energy (1–20) | |
|---|---|
| HIIT group | MICT group |
| 14 | 10 |
| 18 | 8 |
| 12 | 12 |
| 15 | 11 |
| 9 | 7 |
| 16 | 9 |
| 11 | 13 |
| 13 | 8 |
| 10 |
Explain how the researcher would find the critical value to compare against the calculated test statistic.
