Problem-Solving and Data AnalysisEasy–MediumRecognising a self-selected sample
Problem-Solving and Data Analysis practice question
Which of the following is an example of a self-selected sample?
- A. People who phone a radio programme to give their opinion on a question it has posed.Correct
- B. Every tenth shopper leaving a supermarket on a Saturday.
- C. Names drawn at random from a list of all a school's students.
- D. Households reached by a computer dialling randomly generated phone numbers.
Answer: A. People who phone a radio programme to give their opinion on a question it has posed.
Callers decide for themselves whether to take part, and those with strong opinions are far more likely to call. That is self-selection.
Why the other answers are wrong
- B. Every tenth shopper leaving a supermarket on a Saturday.
- Every tenth shopper is a systematic sample chosen by the researcher, not by the shoppers.
- C. Names drawn at random from a list of all a school's students.
- A random draw from a list is a random sample.
- D. Households reached by a computer dialling randomly generated phone numbers.
- Random dialling selects households without their choosing to be selected.
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