APFIVE Optimal Allocation In Stratified Sampling
A researcher is studying income levels across different regions of a country. The population variance in the urban region is much higher than in the rural region. If using stratified random sampling, which approach would likely yield the most precise estimate of the overall mean income?
A
Use equal sample sizes from both regions
B
Sample more heavily from the urban region
C
Sample more heavily from the rural region
D
Sample proportional to population size in each region
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