Paper 1 · Research Aptitude
Which one of the following is known as non-probability sampling?
ACluster sampling
BQuota sampling ✓ Correct
CSystematic sampling
DStratified random sampling
Correct answer: (B) Quota sampling — Quota sampling is a non-probability sampling method, so that is the answer.
Explanation
★Quota sampling is a non-probability sampling method, so that is the answer.
★In quota sampling the researcher fills fixed quotas by choosing cases himself, not by chance.
★So the members do not have a known chance of selection, which makes it non-probability sampling.
★Cluster sampling selects clusters at random, so it is a probability method.
★Systematic sampling picks at fixed intervals from a random start, again a probability method.
★Stratified random sampling draws random samples from strata, so only quota sampling is non-probability.
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