A psychologist investigated the effect of mindfulness meditation on pre-exam anxiety using a questionnaire (with scores ranging from 0 to 20; higher scores indicate higher anxiety).
| No Meditation group | Meditation group | ||
|---|---|---|---|
| Participant | Anxiety Score | Participant | Anxiety Score |
| a | 12 | a | 8 |
| b | 15 | b | 6 |
| c | 18 | c | 9 |
| d | 11 | d | 5 |
| e | 14 | e | 7 |
| f | 16 | ||
| g | 13 | ||
| h | 17 |
What would be the value of n n\,n in the formula below to calculate the standard deviation (SD) of the anxiety scores for the No Meditation group in this study?
SD=∑(x−xˉ)2n SD = \sqrt{\frac{\sum(x - \bar{x})^2}{n}} SD=n∑(x−xˉ)25
8
13
14.5
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.