Question: 2. After considering the sampling problems associated with Problem 1, your friend decides to interview people who literally are on the street. That is, he
2. After considering the sampling problems associated with Problem 1, your friend decides to interview people who literally are \on the street." That is, he stands on a downtown sidewalk and takes as his population passersby who come near enough that he might buttonhole them for an interview. List four sources of bias that you believe might prevent him from obtaining a truly random sample of interviewees.
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