A cognitive psychologist wanted to investigate whether there was a relationship between salivary cortisol levels (a physiological marker of stress) and self-reported stress levels in corporate employees during peak working hours. Seven office worker volunteers were recruited from a local business park. Each participant provided a Saliva sample to determine their cortisol level (measured in micrograms per deciliter, μg/dL\mu\text{g/dL}μg/dL) and completed a validated daily stress questionnaire to score their subjective stress level out of 50.
The results of the stress questionnaire and the cortisol tests are shown in Table 1.
| Participant number | Stress score /50 | Cortisol level (μg/dL\mu\text{g/dL}μg/dL) |
|---|---|---|
| 1 | 18 | 0.22 |
| 2 | 12 | 0.15 |
| 3 | 6 | 0.08 |
| 4 | 45 | 0.52 |
| 5 | 10 | 0.11 |
| 6 | 15 | 0.18 |
| 7 | 38 | 0.45 |
Draw a scatter diagram to represent the data displayed in Table 1.
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