A school has 900 pupils: 540 in Years 8–10 and 360 in Years 11–14. The principal wants a sample that represents both age groups in the same proportions as the school.
Name the most suitable sampling technique.
Give one reason for your answer.
36 exam-style questions on CCEA A Level Maths 2.4 Statistical sampling, covering 2.4.1 Statistical sampling, 2.4.2 Statistical sampling, 2.4.3 Statistical sampling, and 2.4.4 Statistical sampling. Each one has a worked solution and a mark scheme showing where the marks go.