Problem-Solving and Data AnalysisEasyRecognising a random sample
Problem-Solving and Data Analysis practice question
A head teacher wants a random sample of 20 pupils from the school. Which method gives a random sample?
- A. Putting every pupil's name in a box and drawing 20 without looking.Correct
- B. Choosing the first 20 pupils to arrive one morning.
- C. Asking for 20 volunteers.
- D. Choosing the 20 pupils with the highest marks.
Answer: A. Putting every pupil's name in a box and drawing 20 without looking.
Every pupil has the same chance of being drawn.
Why the other answers are wrong
- B. Choosing the first 20 pupils to arrive one morning.
- Early arrivals are not typical of everyone.
- C. Asking for 20 volunteers.
- Volunteers choose themselves.
- D. Choosing the 20 pupils with the highest marks.
- That picks a particular group on purpose.
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