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To ensure each subgroup is proportionally represented in the sample.
Divide the number in the stratum by the total population size.
It produces samples that better represent the whole population.
Each cell is a distinct stratum, simplifying proportional sampling.
0.137 (≈13.7%)
0.449 (5060/11270)
54 people (5060/11270×120=53.87→54)
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