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An employment agency wants to examine the employment rate in a city. The agency's researcher divides the population into the following subgroups: age, gender, graduates,

An employment agency wants to examine the employment rate in a city. The agency's researcher divides the population into the following subgroups: age, gender, graduates, nongraduates, and discipline of graduation and then randomly selects sample members from each of these subgroups. This is an example of

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