A researcher investigated the effect of environmental distraction on working memory performance. Ten participants completed a memory recall task under two conditions: 'Without Distraction' and 'With Distraction'. The number of recall errors made by each participant in each condition is shown in Table 1.
Table 1: Number of recall errors under domestic distraction and quiet conditions
| Participant | Without Distraction | With Distraction |
|---|---|---|
| Participant A | 3 | 8 |
| Participant B | 2 | 5 |
| Participant C | 4 | 11 |
| Participant D | 1 | 7 |
| Participant E | 3 | 9 |
| Participant F | 5 | 12 |
| Participant G | 2 | 6 |
| Participant H | 4 | 8 |
| Participant I | 3 | 10 |
| Participant J | 3 | 4 |
| Mean | 3.0 | 8.0 |
Calculate the standard deviation for the 'With Distraction' condition. Show your working and give your answer to two significant figures.
186 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.