A clinical psychologist investigated sleep disturbances in individuals diagnosed with Major Depressive Disorder (MDD). They asked a sample of 12 patients to self-report their average nightly sleep quality over a month on a scale from 1 (extremely disrupted/poor sleep) to 20 (excellent/restful sleep).
The results for the patients are presented in Table 1 below.
Calculate the measures of central tendency for the data in Table 1 and complete the table with your answers.
Table 1: Sleep quality ratings for patients with MDD
| Participant | Nightly sleep quality rating |
|---|---|
| Patient 1 | 12 |
| Patient 2 | 9 |
| Patient 3 | 14 |
| Patient 4 | 8 |
| Patient 5 | 12 |
| Patient 6 | 11 |
| Patient 7 | 10 |
| Patient 8 | 14 |
| Patient 9 | 9 |
| Patient 10 | 12 |
| Patient 11 | 8 |
| Patient 12 | 13 |
| Mean score | |
| Median score | |
| Mode score |
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.
