There have been recent reports that physical activity can significantly improve sleep quality. A researcher conducted a study to identify a possible relationship between weekly physical exercise and sleep quality in young adults.
The researcher obtained an opportunity sample of 10 students, aged 17–18 years, from a local college. Each student provided self-report data about the number of hours they spent doing moderate-to-vigorous physical exercise over a period of one week.
Each student also completed a standardized sleep quality index questionnaire, which provided a score for their sleep quality. The questionnaire was scored out of 100, where a low score indicated poor sleep quality and a high score indicated excellent sleep quality.
The raw data collected in the study are shown in Table 1 below.
Table 1 The weekly exercise hours and sleep quality scores of 10 students
| Student | Hours of exercise per week | Sleep quality score |
|---|---|---|
| 1 | 2.0 | 45 |
| 2 | 8.0 | 78 |
| 3 | 0.5 | 38 |
| 4 | 12.0 | 88 |
| 5 | 6.0 | 72 |
| 6 | 1.5 | 50 |
| 7 | 10.0 | 82 |
| 8 | 4.0 | 60 |
| 9 | 5.0 | 65 |
| 10 | 9.0 | 75 |
Write a suitable hypothesis for this study.
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