Problem-Solving and Data AnalysisEasy–MediumSpotting a sample that is not representative
Problem-Solving and Data Analysis practice question
To estimate the average number of books read per year by adults in a city, a researcher surveys 200 people leaving the central library. Which statement best describes a problem with this method?
- A. People leaving a library are likely to read more than the average adult, so the estimate will be too high.Correct
- B. 200 people is far too many to survey.
- C. The survey should have asked about films instead.
- D. Adults do not read books.
Answer: A. People leaving a library are likely to read more than the average adult, so the estimate will be too high.
Library users are not typical readers.
Why the other answers are wrong
- B. 200 people is far too many to survey.
- Size is not the problem; selection is.
- C. The survey should have asked about films instead.
- The question is fine.
- D. Adults do not read books.
- Absurd.
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