Calculate the standard deviation for the participants undergoing the mindfulness-based intervention using the attention focus scores data in Table 1. Show your working and give your answer to one decimal place.
Table 1: Attention focus scores for 5 mindfulness participants
| Participant | Focus score |
|---|---|
| A | 15 |
| B | 21 |
| C | 25 |
| D | 27 |
| E | 32 |
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.