A researcher investigated the effect of phonological similarity on short-term memory capacity. Ten participants completed a free recall task under two conditions: 'Phonologically Dissimilar' (words that sound different) and 'Phonologically Similar' (words that sound alike). The number of words correctly recalled by each participant in each condition is shown in Table 1.
Table 1: Number of words recalled under phonologically dissimilar and phonologically similar conditions
| Participant | Phonologically Dissimilar | Phonologically Similar |
|---|---|---|
| Participant A | 9 | 4 |
| Participant B | 12 | 9 |
| Participant C | 8 | 3 |
| Participant D | 10 | 7 |
| Participant E | 11 | 5 |
| Participant F | 14 | 10 |
| Participant G | 9 | 6 |
| Participant H | 11 | 4 |
| Participant I | 13 | 8 |
| Participant J | 8 | 4 |
| Mean | 10.5 | 6.0 |
Calculate the standard deviation for the 'Phonologically Similar' condition. Show your working and give your answer to two significant figures.
Practise Edexcel A Level Psychology Research methods and skills with exam-style questions for A Level Psychology. 657 questions covering Research methods and skills, 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.
