Which data collections show bias? Check all that apply.

A survey is biased when its collection method is likely to leave out important groups or overrepresent a particular group. Asking only the bank’s 25 wealthiest customers overrepresents wealthy customers, and asking only fifth graders may not reflect the preferences of all students. College students at an honors library are also a narrow group and may not represent all voters. The raffle tickets are drawn from the full set, and weighing every tenth semi-trailer is a systematic sample without an obvious source of bias.

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