APFIVE Properties of Stratified Random Sampling
A market researcher is studying consumer preferences across different age groups. If she uses a stratified random sampling approach with age as the stratification variable, which of the following must be true about the sampling process?
A
Simple random sampling occurs within each age group
B
Participants must be randomly assigned to age groups
C
The oldest age group must be sampled first
D
Each age group must have the same number of participants
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