Andy was a senior in college, majoring in marketing. He received a call to participate in a survey on behalf of a company that was targeting graduating seniors. At the end of the survey, Andy was asked for the name of a friend who was also a senior in marketing. This is an example of using a "snowball" sample.

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This is an example of a snowball sample because the survey administrator is asking Andy for the name of a friend who is also a senior in marketing, thus "snowballing" the sample by gaining more participants through the referrals of the original participants.

Andy Was a Senior in College, Majoring in Marketing