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 |
Practise Edexcel A Level Psychology Methods with exam-style questions for A Level Psychology. 638 questions, matched to the Edexcel A Level Psychology (9PS0) 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.