A neuroscientist investigated the relationship between electronic screen usage before bed and subsequent sleep hormone levels. A sample of ten healthy adults had their screen exposure time (in minutes) monitored during the two hours prior to bedtime. The following morning, their salivary melatonin concentration (measured in picograms per milliliter, pg/mL\text{pg/mL}pg/mL) was recorded.
The results are shown in the table below:
| Participant | Screen exposure (minutes) | Melatonin level (pg/mL\text{pg/mL}pg/mL) |
|---|---|---|
| A | 110 | 12 |
| B | 45 | 32 |
| C | 15 | 45 |
| D | 90 | 18 |
| E | 120 | 8 |
| F | 30 | 38 |
| G | 60 | 25 |
| H | 0 | 55 |
| I | 75 | 22 |
| J | 105 | 15 |
Explain what p<0.01 p < 0.01\,p<0.01 would mean in the significance statement for the result of the Spearman's rho test from this study.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.