Problem-Solving and Data AnalysisEasyWhy samples are used
Problem-Solving and Data Analysis practice question
A researcher wants to know the average commuting time of the 200,000 workers in a city. Which of the following is the best reason to survey a random sample rather than every worker?
- A. Surveying every worker would be far more costly and slow, while a random sample can estimate the average well.Correct
- B. A sample always gives the exact population average.
- C. Most workers would refuse to answer.
- D. Commuting times cannot be measured.
Answer: A. Surveying every worker would be far more costly and slow, while a random sample can estimate the average well.
Cost and time, with a good estimate in return.
Why the other answers are wrong
- B. A sample always gives the exact population average.
- A sample estimates; it is not exact.
- C. Most workers would refuse to answer.
- Nothing suggests refusal.
- D. Commuting times cannot be measured.
- They can be measured.
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