Two simple random samples of 80 voters from the same town give estimates 0.44 and 0.51 for the proportion supporting a proposal.
Explain why the estimates differ.
State how increasing the sample size would generally affect this variation.
Explain why a census could still contain error.
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.