Problem-Solving and Data AnalysisEasyChoosing a representative sample
Problem-Solving and Data Analysis practice question
A school wants to estimate what fraction of its 900 students walk to school. Which sample would give the most reliable estimate?
- A. 90 students chosen at random from the whole schoolCorrect
- B. The 90 students who arrive earliest
- C. The 90 students in the football club
- D. The 90 students who live nearest the school
Answer: A. 90 students chosen at random from the whole school
A random sample from the whole population is representative.
Why the other answers are wrong
- B. The 90 students who arrive earliest
- Early arrivers may travel differently from the rest.
- C. The 90 students in the football club
- One club is not the whole school.
- D. The 90 students who live nearest the school
- Those living nearest are more likely to walk.
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