A researcher carried out a study to investigate sleep patterns among Year 12 sociology students from two local sixth-form colleges.
College X has 60 Year 12 sociology students, and College Y has 40 Year 12 sociology students. The researcher used a stratified sampling method to select a sample of 20 Year 12 sociology students to represent these two colleges.
Explain how the researcher might have obtained the stratified sample of 20 Year 12 sociology students from the two different sixth-form colleges.
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.