Calculate the standard deviation for the participants who completed the mindfulness course using the stress reduction scores in Table 1. Show your working and give your answer to one decimal place.
Table 1: Stress reduction scores for 5 mindfulness participants
| Participant | Stress reduction score |
|---|---|
| A | 15 |
| B | 22 |
| C | 25 |
| D | 28 |
| E | 30 |
638 exam-style questions on Edexcel A Level Psychology Methods. Each one has a worked solution and a mark scheme showing where the marks go.