Which of the following sampling methods is a non-probability method?
Answer and explanation
Correct answer: D. Quota sampling
- Step 1: In probability methods each item has a known chance of selection.
- Step 2: Quota sampling relies on the interviewer's choice to fill quotas, so selection chances are unknown.
Answer
Quota sampling.
Why not the others: Systematic sampling: Systematic sampling selects every nth item from a list after a random start, and this is a probability method. Stratified sampling: Stratified sampling selects randomly within each group, so each member has a known chance of selection. Multistage sampling: Multistage sampling uses random selection at each stage, so it is a probability method.
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