Identify what is wrong. In a USA Today online poll, 951 Internet users chose to respond, and $57 \%$ of them said that they prefer drinking bottled water instead of tap water.
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This means that the people who chose to respond to the poll are self-selected and may not be representative of the entire population. Show more…
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Gallup At its website (www.gallup.com) the Gallup Poll publishes results of a new survey each day. Scroll down to the end, and you’ll find a statement that includes words such as these: Results are based on telephone interviews with 1,008 national adults, aged 18 and older, conducted January 3–5, 2013. . . . In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls. a) For this survey, identify the population of interest. b) Gallup performs its surveys by phoning numbers generated at random by a computer program. What is the sampling frame? c) What problems, if any, would you be concerned about in matching the sampling frame with the population?
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