AQA All About Maths
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Topic: Collecting Data (Higher - Unit 1)
Specification References: S2.2
S2.2
Identify possible sources of bias.
Candidates should be able to:
understand how and why bias may arise in the collection of data
offer ways of minimising bias for a data collection method
Examples
Sandra is asking people’s opinions on their postal service.
She asks 50 people from one street.
Give a reason why this may be a biased sample.
view more examples
A factory manager checks the first 20 items made each day for quality.
Suggest a better method the manager could use without checking more items.
Salima is collecting data about the speed of cars in her town.
She decides to collect data during the rush hour.
Comment on Salima’s choice of sample.