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In a COVID-19 vaccine trial, 120 subjects were randomly selected from the United States, 125 subjects were randomly selected from Canada, and 100 subjects were

In a COVID-19 vaccine trial, 120 subjects were randomly selected from the United States, 125 subjects were randomly selected from Canada, and 100 subjects were randomly selected from Mexico. This type of sampling is called a cluster, convenience, systematic, or a stratified? why?

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