Paper 1 · Research Aptitude
A researcher divides school students on the basis of gender and then, using a random-digit table, selects some from each group. This process is called
AStratified sampling only
BStratified random sampling ✓ Correct
CRepresentative sampling
DConvenience sampling
Correct answer: (B) Stratified random sampling — Dividing by gender and then randomly selecting from each group is stratified random sampling, so that is the answer.
Explanation
★Dividing by gender and then randomly selecting from each group is stratified random sampling, so that is the answer.
★First the population is split into strata, here by gender.
★Then a random sample is drawn from each stratum using the random-digit table.
★This combination of stratifying and then random selection is stratified random sampling.
★Calling it merely stratified leaves out the random step that is clearly used here.
★Convenience sampling has no such randomness, so the process is stratified random sampling.
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