Discussion
Which of the following sampling methods is appropriate to study the prevalence of diabetes among male and female in India in 1988, 1998, 2008, 2018 ?
Answer: D
The appropriate method is stratified random sampling.
The study compares the prevalence of diabetes among males and females, so the population should be divided into strata by sex and a random sample drawn from each stratum. This ensures both groups are adequately represented in each survey year and allows a valid comparison.
Cluster sampling selects whole groups such as villages and does not guarantee balance by sex. Systematic sampling takes every kth unit from a list, and convenience sampling uses whoever is available, which is biased and unsuitable for estimating prevalence.
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