Paper 1 · Research Aptitude
Which of the following is often said not to be a purely random sampling method?
ASystematic sampling ✓ Correct
BStratified random sampling
CSimple random sampling
DLottery-based random sampling
Correct answer: (A) Systematic sampling — Systematic sampling is often said not to be a purely random method, so that is the answer.
Explanation
★Systematic sampling is often said not to be a purely random method, so that is the answer.
★Systematic sampling chooses only the first member at random and then takes every kth after it.
★So once the start is fixed, the rest follow a fixed rule rather than pure chance, so it is not purely random.
★Stratified random sampling draws a genuine random sample within each stratum.
★Simple random sampling gives every member an equal chance purely by chance.
★Lottery-based selection is a form of simple random sampling, so only systematic sampling is not purely random.
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