Discussion
Which one of the following is not a random sampling method ?
Answer: D
Judgement sampling is not a random sampling method, option D. In judgement (purposive) sampling the researcher chooses the units by personal judgement, so units do not have a known chance of selection and the sampling error cannot be computed in the usual way.
Stratified sampling (option A) draws random samples from each stratum. Cluster sampling (option B) randomly selects whole groups. Systematic sampling (option C) takes every k-th unit after a random start, and it is a probability method because the start is random. All three use chance in selection, and judgement sampling does not.
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