A music festival wants feedback from adults and children. An interviewer is told to obtain 30 adult responses and 20 child responses, choosing people near the main stage.
State the sampling technique.
Explain one benefit and one source of bias.
36 exam-style questions on OCR A Level Maths 2.1 Statistical Sampling, covering 2.1.1 Population and sample, 2.1.2 Informal inferences from samples, 2.1.3 Sampling techniques, 2.1.4 Selecting or critiquing sampling techniques, and 2.1 Statistical Sampling. Each one has a worked solution and a mark scheme showing where the marks go.