AQA · Mathematics · 8300
GCSE Maths: Sampling: random
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths practice questions for Sampling: random (Corbettmaths Video 282), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What is meant by a random sample?
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A sample in which every member of the population has an equal chance of being selected.
Describe a method to take a random sample of 20 cows from 480 cows.
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Number all 480 cows from 1 to 480, then use a random number generator or table to select 20 different numbers between 1 and 480. Select the cows with those numbers.
Why would interviewing 10 employees in the company canteen on Friday lunchtime NOT give a random sample?
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Not all employees have an equal chance of being selected—only those who use the canteen on Friday lunchtimes can be chosen. This introduces bias.
How do you use random numbers from a table to choose 15 people from 50 people?
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Number the 50 people from 01 to 50. Read numbers from the table (ignoring any above 50 or duplicates) until you have 15 unique numbers. Select the people with those numbers.
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