A cognitive psychologist wanted to investigate whether background noise type impacts concentration during complex tasks. To do this, she conducted an independent measures experiment. Group 1 listened to classical music while working, while Group 2 listened to continuous white noise. After the task, each participant was given a concentration score from 1 ('extremely distracted') to 50 ('perfectly focused').
| Concentration Scores (1–50) | |
|---|---|
| Classical music group | White noise group |
| 42 | 31 |
| 45 | 28 |
| 38 | 35 |
| 47 | 33 |
| 41 | 40 |
| 36 | 29 |
| 44 | 34 |
| 40 | 27 |
| 43 | 32 |
| 36 | |
| 30 | |
| 25 |
Explain how you would find the critical value to compare the calculated value to after conducting this test.
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.