A researcher is investigating the physical fitness of members at a local sports club. The club has 450 adult members and 150 junior members. The researcher wants to select a sample of 80 members. They decide to select 60 adult members and 20 junior members by putting all adult names in one container and all junior names in another container, and drawing the names out. Which sampling technique has been used?
Stratified sampling
Quota sampling
Opportunity sampling
Systematic sampling
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.