A psychologist conducted an experiment to investigate the effects of environmental distraction on memory recall. Ten participants were asked to memorize a list of 15 words under two conditions: a quiet condition and a noisy condition. The results are shown in Table 1 below.
Table 1: Number of words recalled under quiet and noisy conditions
| Participant | Quiet condition | Noisy condition |
|---|---|---|
| Participant A | 9 | 5 |
| Participant B | 8 | 8 |
| Participant C | 6 | 3 |
| Participant D | 10 | 10 |
| Participant E | 7 | 7 |
| Participant F | 8 | 4 |
| Participant G | 9 | 9 |
| Participant H | 10 | 6 |
| Participant I | 7 | 8 |
| Participant J | 9 | 10 |
| Mean | 8.3 | 7.0 |
Calculate the standard deviation for the noisy 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.