An aquatic ecologist wanted to investigate the concentration of microplastic fibers in the digestive tracts of two predatory fish species, brown trout (Salmo trutta) and European perch (Perca fluviatilis), within a national park's lake system. The researcher randomly selected 8 lakes from the 12 major lakes in the park. Only 6 of these 8 selected lakes were granted access permits for scientific gillnetting. From each of these 6 permitted lakes, the researcher captured and analyzed the stomach contents of 12 brown trout and 12 European perch.
Identify the sample used by the researcher in 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.
