Cluster Sampling
A sampling method that divides the population into naturally occurring clusters, randomly selects some clusters, and includes all members of selected clusters in the sample.
Real World
A researcher studying GCSE attainment across England randomly selects 20 schools from a list and surveys every pupil in those schools, rather than travelling to hundreds of individual students nationwide.
Exam Focus
Distinguish cluster from stratified sampling in 'compare' questions — clusters are randomly selected whole groups, not proportional sub-samples.
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