Problem-Solving and Data AnalysisEasyChoosing a representative sample
Problem-Solving and Data Analysis practice question
A researcher wants to estimate the mean height of all 1,200 pupils at a school. Which of the following samples would give the most reliable estimate?
- A. 100 pupils selected at random from the whole schoolCorrect
- B. The members of the school basketball team
- C. The first 20 pupils to arrive one morning
- D. All the pupils in one class
Answer: A. 100 pupils selected at random from the whole school
A random sample from the whole population avoids systematic bias.
Why the other answers are wrong
- B. The members of the school basketball team
- Basketball players tend to be tall.
- C. The first 20 pupils to arrive one morning
- Early arrivals are not chosen at random, and 20 is small.
- D. All the pupils in one class
- One class is one age group.
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