Many teenagers claim that using social media before bed affects their sleep quality. A sociologist decided to investigate this claim. Fifty teenage students from a local secondary school volunteered to take part in the study. They each answered the following question:
'Do you think that your sleep quality is 'better', 'worse' or 'the same' after using social media in the hour before sleeping?'
She obtained the results in Table 1.
Table 1: Responses to question - 'Do you think that your sleep quality is 'better', 'worse' or 'the same' after using social media in the hour before sleeping?'
| Better | Worse | The same |
|---|---|---|
| 5 | 33 | 12 |
Explain why using stratified sampling might improve this study.
Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) 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.
