Discussion
Which of the following is the nonrandom method of selecting samples from a population ?
Answer: B
Quota sampling is the non-random method of selecting samples. The interviewer is given a quota of persons of each type to cover and picks them by judgement or convenience, so not every unit has a known chance of being chosen. Stratified, systematic and cluster sampling are all probability methods: a stratified sample draws at random from each stratum, a systematic sample takes every kth unit after a random start, and a cluster sample draws whole groups at random. So the keyed answer is option B.
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