Which sampling method would you use to ensure subgroups are represented proportionally to the national population?

Which sampling method would you use to ensure subgroups are represented proportionally to the national population?

• A. Stratified Sampling
• B. Systematic Random Sample
• C. Quota Sampling
• D. Convenience Sample

Answer: (B)

To ensure subgroups are represented proportionally to the national population, use stratified sampling. You split the population into meaningful subgroups (strata) based on a characteristic that matters for the study, such as age groups, gender, or region. Then you draw samples from each stratum in proportion to how large that subgroup is in the population. By doing this, the overall sample reflects the same distribution of subgroups as the country as a whole, which improves the accuracy of estimates for each subgroup and for the whole sample. Systematic random sampling, while simple and good for spreading the sample across a list, doesn’t automatically guarantee proportional representation of subgroups. Quota sampling aims for proportional subgroups but is non-probabilistic, which can introduce bias. Convenience sampling is non-representative and relies on who is easiest to recruit. So for proportional subgroup representation with a probabilistic framework, stratified sampling is the best approach.

To ensure subgroups are represented proportionally to the national population, use stratified sampling. You split the population into meaningful subgroups (strata) based on a characteristic that matters for the study, such as age groups, gender, or region. Then you draw samples from each stratum in proportion to how large that subgroup is in the population. By doing this, the overall sample reflects the same distribution of subgroups as the country as a whole, which improves the accuracy of estimates for each subgroup and for the whole sample.

Systematic random sampling, while simple and good for spreading the sample across a list, doesn’t automatically guarantee proportional representation of subgroups. Quota sampling aims for proportional subgroups but is non-probabilistic, which can introduce bias. Convenience sampling is non-representative and relies on who is easiest to recruit. So for proportional subgroup representation with a probabilistic framework, stratified sampling is the best approach.