Problem-Solving and Data AnalysisEasySpotting a biased sample
Problem-Solving and Data Analysis practice question
A store asked customers as they left the store with their shopping whether they liked the store, and 95% said yes. The store claims that 95% of people in the town like the store. Which of the following is the best reason the claim is not justified?
- A. Only people who had just chosen to shop at the store were asked.Correct
- B. 95% is too high a percentage to be true.
- C. The customers were asked on a weekday.
- D. The store did not ask enough questions.
Answer: A. Only people who had just chosen to shop at the store were asked.
People shopping there already like it enough to shop there; the town's other residents were not asked.
Why the other answers are wrong
- B. 95% is too high a percentage to be true.
- A high percentage is not by itself impossible.
- C. The customers were asked on a weekday.
- The day is not the problem.
- D. The store did not ask enough questions.
- One question is fine; who was asked is the issue.
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