Two independent random samples of 30 households from the same town give different estimates of the proportion using public transport.
Explain why the estimates can differ and state what would generally happen to this sampling variation if much larger random samples were used.
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.