How does the intensity of different university courses affect students' sleep? Educational researchers investigated this by distributing a daily diary questionnaire to undergraduates. The data below show the self-reported ratings of subjective sleep quality (1 = 'extremely poor sleep' to 10 = 'excellent sleep') from the first 20 history students and the first 20 medical students who completed the survey on a specific Tuesday morning.
Table 1: Ratings of sleep quality by academic discipline
| History Students | Medical Students |
|---|---|
| 8 | 3 |
| 7 | 8 |
| 8 | 1 |
| 9 | 9 |
| 8 | 2 |
| 7 | 10 |
| 8 | 4 |
| 6 | 7 |
| 8 | 5 |
| 9 | 8 |
| 7 | 2 |
| 8 | 9 |
| 8 | 3 |
| 7 | 6 |
| 9 | 1 |
| 8 | 8 |
| 7 | 10 |
| 8 | 4 |
| 9 | 7 |
| 8 | 5 |
Outline one conclusion from the calculation of the range for the rating of sleep quality given by history students and medical students.
