Dr Vance is interested in exploring whether sleep deprivation affects cognitive processing speed. He conducts an experiment where participants are asked to complete a complex visual search task after either 8 hours of sleep (Fully Rested condition) or 4 hours of sleep (Sleep Deprived condition). The time taken (in seconds) to complete the task is recorded.
Table 1 shows the raw data from the study.
| Participant number | Time taken in seconds (Fully Rested) | Time taken in seconds (Sleep Deprived) |
|---|---|---|
| 1 | 13 | 18 |
| 2 | 19 | 24 |
| 3 | 11 | 19 |
| 4 | 15 | 22 |
| 5 | 18 | 25 |
| 6 | 12 | 21 |
| 7 | 17 | 23 |
| 8 | 10 | 20 |
| 9 | 20 | 26 |
| 10 | 15 | 22 |
Calculate the standard deviation for the time taken to complete the task in the Fully Rested condition. Show your working and give your answer to two decimal places.
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.