In a region, 70% of households are urban and 30% are rural. A survey samples 40 urban households and 60 rural households. Of these, 24 urban households and 48 rural households support a proposal.
Calculate the proportion supporting the proposal within each group.
Calculate a population-weighted estimate of the overall proportion of households that support the proposal.
Explain why using the unweighted sample proportion would be misleading.
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.