Paper 1 · Research Aptitude
An investigator wants to study the vocational aspirations of visually challenged children spread over a wide geographical area. He should select his sample using
ASimple random sampling
BStratified sampling ✓ Correct
CPurposive sampling
DConvenience sampling
Correct answer: (B) Stratified sampling — For visually challenged children spread over a wide area, stratified sampling should be used, so that is the answer.
Explanation
★For visually challenged children spread over a wide area, stratified sampling should be used, so that is the answer.
★Such children form distinct sub-groups spread across different regions and conditions.
★Stratified sampling divides them into these strata and draws a sample from each, so every group is represented.
★Simple random sampling over a wide area may miss the smaller sub-groups by chance.
★Purposive sampling picks cases by the researcher's judgement, which is less systematic here.
★Convenience sampling takes whoever is easy to reach, ignoring fair coverage, so stratified sampling is best.
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