Researchers wished to investigate the relationship between mindfulness practice and exam anxiety in teenagers. They wanted to obtain a stratified sample of 120 17-year-old students from three different sixth-form colleges. Some of these colleges had a very large student population, while others were much smaller.
Explain how the researchers could obtain a stratified sample of 120 students from the three different 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.