Paper 1 · Research Aptitude
A researcher selects a probability sample of 100 out of the total population purely by chance. It is called
AA quota sample
BA simple random sample ✓ Correct
CA stratified random sample
DA systematic sample
Correct answer: (B) A simple random sample — Selecting 100 purely by chance from the whole population is a simple random sample, so that is the answer.
Explanation
★Selecting 100 purely by chance from the whole population is a simple random sample, so that is the answer.
★In a simple random sample every member has an equal chance and the choice is made purely by chance.
★So drawing 100 from the total population by chance alone is a simple random sample.
★A quota sample fills fixed quotas by the researcher's choice, not by chance.
★A stratified random sample first divides the population into strata, which is not stated here.
★A systematic sample picks at fixed intervals, so pure chance selection is a simple random sample.
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