Anytime survey is conducted care must be taken to avoid undercoverage. Suppose a firm selects 500 names from a city phonebook calls their home between noon and 4 PM and the interview whoever answers anticipating contacts with at least 200 people Is there a problem with response bias or undercoverage?
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In this case, the firm is selecting names from a city phonebook. This means that people who do not have their names in the phonebook, such as those without a landline or those who have unlisted numbers, are not included in the sample. This is a clear case of Show more…
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Phone surveys Any time 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 P.M., 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, sampling 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 number, 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 design? Is anyone still excluded?
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, sampling 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 number, 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 design? Is anyone still excluded?
Gathering Data
Sample Surveys
The survey has bias. (a) Determine the type of bias. (b) Suggest a remedy. Cold Stone Creamery is considering opening a new store in O'Fallon. Before opening, the company wants to know the percentage of households in O'Fallon that regularly visit an ice cream shop. The market researcher obtains a list of households in O'Fallon, randomly selects $150,$ and mails a questionnaire that asks about ice cream eating habits and flavor preferences. Of the 150 questionnaires mailed, 4 are returned.
Data Collection
Bias in Sampling
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