Discussion
Which one of the following is a probability sampling ?
Answer: A
Cluster sampling is a probability sampling method, since each cluster has a known chance of selection when chosen at random. This allows sampling error to be estimated.
Convenience sampling takes whatever cases are easy to reach, judgement sampling lets the researcher decide who is typical, and quota sampling fills fixed numbers from groups by the interviewer's choice. All three are non-probability designs, so the answer is cluster sampling.
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