Ball Williams
06/05/2023 · Elementary School
17. Parent opinion, part 1 In a large city selvol system with 20 elementary schools, the school board is considering the adop- tion of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. Listed below are some of the ideas proposed for gathering data For cach, indicate what kind of sampling strategy is involved and what (if any) biases might result. a) Put a big ad in the newspaper asking people to log their opinions on the PTA website. b) Randomly select one of the elementary schools and contact
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a) The ad in the newspaper uses voluntary response sampling, which may lead to self-selection and demographic biases.
b) Randomly selecting one school for contact is cluster sampling, which may result in limited generalizability and cluster bias.
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