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the president sends out a survey to a random sample of students in the school.what kind of sample is this?
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the president sends out a survey to a random sample of students in the school.what kind of sample is this?

User Amir Gorji
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This is a purposive sample.  This is because it's a subset of the larger population that isn't representative - for example, the set of students generally does not include older people.
User Joseph Victor
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