Phone surveys Anytime we conduct a survey, we musttake care to avoid undercoverage. Suppose we plan toselect 500 names from the city phone book, call theirhomes between noon and 4 pm, and interview whoeveranswers, anticipating contacts with at least 200 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 adult is contacted and interviewed. How does this improvethe sampling design?e) Random-digit dialing machines can generate the phone calls for us. How would this improve our de-sign? Is anyone still excluded?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 6E
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Phone surveys Anytime we conduct a survey, we must
take care to avoid undercoverage. Suppose we plan to
select 500 names from the city phone book, call their
homes between noon and 4 pm, and interview whoever
answers, anticipating contacts with at least 200 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 in
the eventual sample of opinion? Excluded?
d) Suppose, instead, that we continue calling each num-
ber, perhaps in the morning or evening, until an adult
is contacted and interviewed. How does this improve
the sampling design?
e) Random-digit dialing machines can generate the
phone calls for us. How would this improve our de-
sign? Is anyone still excluded?
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