Problem-Solving and Data AnalysisEasy–MediumA claim from a tiny sample
Problem-Solving and Data Analysis practice question
A café asked 10 customers to try a new flavour of ice cream, and 8 said they liked it. The café then advertised: "80% of customers love our new flavour." Which of the following is the best reason the advertisement's claim is weak?
- A. Only 10 people were asked, far too few to represent all customers.Correct
- B. 80% is not a real percentage.
- C. The customers were not paid.
- D. Ice cream flavours cannot be surveyed.
Answer: A. Only 10 people were asked, far too few to represent all customers.
A sample of 10 gives a very unreliable estimate.
Why the other answers are wrong
- B. 80% is not a real percentage.
- 8 of 10 is 80%.
- C. The customers were not paid.
- Payment is irrelevant.
- D. Ice cream flavours cannot be surveyed.
- Surveys about flavours are perfectly possible.
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