A wildlife charity wants to estimate the proportion of nesting boxes in a region that are occupied. Boxes are grouped into 24 woodland sites. The charity can inspect 120 of the 960 boxes.
Describe a stratified random sample using woodland site as the stratum.
Describe a cluster sample for the same investigation.
Give one reason for preferring each method in this context.
36 exam-style questions on OCR A Level Maths 2.1 Statistical Sampling, covering 2.1.1 Population and sample, 2.1.2 Informal inferences from samples, 2.1.3 Sampling techniques, 2.1.4 Selecting or critiquing sampling techniques, and 2.1 Statistical Sampling. Each one has a worked solution and a mark scheme showing where the marks go.