Phone surveys. Anytime we conduct a survey, wemust take

Chapter 12, Problem 27

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Phone surveys. Anytime we conduct a survey, wemust take care to avoid undercoverage. Suppose weplan to select 500 names from the city phone book, calltheir homes between noon and 4 p.m., and interviewwhoever answers, anticipating contacts with at least200 people.a) Why is it difficult to use a simple random sample here?b) Describe a more convenient, but still random, sam-pling strategy.c) What kinds of households are likely to be included inthe eventual sample of opinion? Excluded?d) Suppose, instead, that we continue calling each num-ber, perhaps in the morning or evening, until an adultis contacted and interviewed. How does this improvethe sampling design?e) Random-digit dialing machines can generate the phonecalls for us. How would this improve our design? Isanyone still excluded?

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