Paper 1 · Research Aptitude
From the list given below, identify those which are called non-probability sampling procedures:
- Simple random sampling
- Dimensional sampling
- Snowball sampling
- Cluster sampling
- Quota sampling
- Stratified sampling
A1, 2 and 3
B2, 4 and 5
C1, 3 and 6
D2, 3 and 5 ✓ Correct
Correct answer: (D) 2, 3 and 5 — The non-probability procedures are 2, 3 and 5, that is dimensional, snowball and quota sampling, so that is the answer.
Explanation
★The non-probability procedures are 2, 3 and 5, that is dimensional, snowball and quota sampling, so that is the answer.
★A non-probability procedure does not give every member a known chance of selection.
★Dimensional sampling selects cases to cover chosen dimensions by the researcher's design, not by chance.
★Snowball sampling grows the sample through referrals from earlier participants.
★Quota sampling fills fixed quotas by the researcher's choice, so it too is non-probability.
★Simple random, cluster and stratified sampling all use chance-based selection, so they are probability methods and are excluded.
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