A market researcher has no complete list of households. She sets quotas by age group and interviews convenient people until each quota is filled.
Explain why this is quota sampling rather than stratified random sampling.
Give one advantage and one disadvantage of her method.
36 exam-style questions on OCR (MEI) A Level Maths 2.1 Sampling, covering 2.1.1 Population and sample, 2.1.2 Samples to make informal inferences, 2.1.3 Random sampling, 2.1.4 Variety of sampling techniques, 2.1.5 Select or evaluate sampling techniques, and 2.1 Sampling. Each one has a worked solution and a mark scheme showing where the marks go.