Sample
A subset of the population selected for investigation. The sample is studied to make inferences about the population. A good sample should be representative and unbiased.
Real World
YouGov surveys a sample of around 1,000–2,000 UK adults to predict general election voting intentions for millions of voters, publishing results within days rather than years.
Exam Focus
Always justify why a sample is preferred over a census — cost, time, and practicality are the three key reasons.
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