What sampling method used for senior classes last semester

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Reference no: EM13132901

A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?

Reference no: EM13132901

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What sampling method used for senior classes last semester : A survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
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