Question: Which sampling plan should be used when (a) there are well-defined subpopulations in the target population that need to be represented in the sample? (b)

Which sampling plan should be used when

(a) there are well-defined subpopulations in the target population that need to be represented in the sample?

(b) information is needed on a small but important subset of the target population?

(c) the units in the population are homogeneously distributed?

(d) the units in the population are heterogeneously distributed?

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