A researcher measured the morning salivary cortisol levels (in mcg/dL) of a participant at 8:00 AM over an eight-day period during a stress-management study.
Table 1: Morning cortisol levels over an eight-day period
| Day | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Cortisol Level (mcg/dL) | 14.2 | 13.8 | 15.0 | 14.5 | 12.9 | 13.5 | 14.8 | 15.1 |
Explain one reason why the mean is the most appropriate measure of central tendency for this set of data.
Practise AQA A Level Psychology Data handling and analysis with exam-style questions for A Level Psychology. 263 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
