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Problem-Solving and Data AnalysisEasySample that does not represent a town

Problem-Solving and Data Analysis practice question

A researcher stands outside a gym and asks people leaving it whether they exercise every week. 90% say yes. Why can the researcher not conclude that 90% of the town exercises every week?

  1. A. People leaving a gym are far more likely to exercise than the town as a whole.Correct
  2. B. 90% is too high a number to be true.
  3. C. The researcher should have asked inside the gym.
  4. D. People leaving a gym are tired.

Answer: A. People leaving a gym are far more likely to exercise than the town as a whole.

The sample was drawn from exactly the people who exercise.

Why the other answers are wrong

B. 90% is too high a number to be true.
The number could be true for gym-goers; the problem is the sample.
C. The researcher should have asked inside the gym.
Inside or outside, it is still gym-goers.
D. People leaving a gym are tired.
Tiredness does not affect the answer.

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