Problem-Solving and Data AnalysisEasy–MediumRecognising a biased sample
Problem-Solving and Data Analysis practice question
To estimate how many households in a town own a dog, a researcher surveys 100 people at a dog show. Which statement best describes the problem with this sample?
- A. People at a dog show are more likely than other residents to own dogs, so the estimate will be too high.Correct
- B. 100 people is too few for any estimate.
- C. The survey should have been done online.
- D. Dog shows are not held in every town.
Answer: A. People at a dog show are more likely than other residents to own dogs, so the estimate will be too high.
A dog-show crowd is not typical of the town.
Why the other answers are wrong
- B. 100 people is too few for any estimate.
- 100 can be enough if the sample is random.
- C. The survey should have been done online.
- The method of contact is not the flaw.
- D. Dog shows are not held in every town.
- Irrelevant.
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