A survey of customers is carried out by randomly selecting 50 customers from each of three age bands, in proportion to the size of the bands. What type of sampling is this?
Answer and explanation
Correct answer: C. Stratified sampling
- Step 1: The population is divided into age bands (strata).
- Step 2: A random sample is drawn from each stratum, in proportion to its size.
Answer
Stratified sampling.
Why not the others: Cluster sampling selects whole groups, then surveys everyone in the chosen groups. Quota sampling fills quotas without random selection. Simple random sampling draws from the whole population without bands.
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