Dr Aris is interested in exploring whether background noise type affects memory recall. He conducts an experiment where participants are asked to recall a list of 20 words while listening to either instrumental music or cafe chatter.
Table 1 shows the raw data from the study.
| Participant number | Number of words recalled (Instrumental Music) | Number of words recalled (Cafe Chatter) |
|---|---|---|
| 1 | 12 | 9 |
| 2 | 15 | 11 |
| 3 | 8 | 6 |
| 4 | 11 | 8 |
| 5 | 14 | 12 |
| 6 | 10 | 7 |
| 7 | 13 | 10 |
| 8 | 9 | 5 |
| 9 | 16 | 8 |
| 10 | 12 | 10 |
Calculate the standard deviation for the number of words recalled in the Instrumental Music condition. Show your working and give your answer to two decimal places.
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