The Centers for Disease Control and Prevention conduct the yearly National Health Interview Survey (NHIS). A decription of their methodology is given: “To achieve sampling efficiency and to keep survey operations manageable, cost-effective, and timely, the NHIS survey planners used multistage sampling techniques to select the sample of persons and households for the NHIS. These multistage methods partition the target universe into several nested levels of strata and clusters
[Answered]: The Centers for Disease Control and Prevention…
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