Many commercial fishermen claim that the installation of an offshore wind farm has impacted their daily catch sizes. A maritime researcher decided to investigate this claim. Sixty commercial fishermen from a local port volunteered to take part in the study. They each answered the following question:
'Do you feel that your daily catch size is 'increased', 'decreased' or 'remained stable' since the offshore wind farm became operational?'
He obtained the results shown in Table 1.
Table 1: Responses to question - 'Do you feel that your daily catch size is 'increased', 'decreased' or 'remained stable' since the offshore wind farm became operational?'
| Increased | Decreased | Remained stable |
|---|---|---|
| 8 | 39 | 13 |
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.
