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.
689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.