Measles is very rare in the United States. A group of researchers was able to collect demographic and clinical data from 25 reported cases in the Southeast states. These researchers used a:

Name: Measles is very rare in the United States. A group of researchers was able to collect demographic and clinical data from 25 reported cases in the Southeast states. These researchers used a:
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Question

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Because only a subset of the population, the Southeast states, was studied, the researchers used a sample.

Measles Is Very Rare in the United States