A biological psychologist investigated the relationship between salivary cortisol levels measured just before sleep and the duration of slow-wave sleep (SWS) obtained during the night.
| Participant | Salivary cortisol level (μg/dL\mu\text{g/dL}μg/dL) | Duration of slow-wave sleep (minutes) |
|---|---|---|
| A | 0.12 | 110 |
| B | 0.28 | 85 |
| C | 0.05 | 125 |
| D | 0.40 | 50 |
| E | 0.18 | 100 |
| F | 0.35 | 65 |
| G | 0.22 | 90 |
| H | 0.45 | 40 |
State the type of relationship shown in the data in Table 1.
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