An environmental scientist is monitoring microplastic contamination levels in freshwater mussels across two distinct zones of a nature reserve's lake.
Zone A (shallow shoreline) has a population of 540 mussels, and Zone B (deep benthic zone) has a population of 360 mussels. The scientist wants to obtain a stratified sample of 80 mussels to assess tissue contamination.
Explain how the scientist should obtain the stratified sample of 80 mussels from the two different zones of the lake.
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.
