Lesson K1

K1 Populations, samples and sampling techniques Quiz: AQA Maths, Unit 11

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson K1, Populations, samples and sampling techniques: 20 multiple choice questions for the AQA Maths (7357), Unit 11: Statistics, written with Revision Ninja.

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The 20 questions

  1. In statistics, what term describes the entire group of individuals being studied?

    • Sample
    • Sampling frame
    • Population
    • Census

  2. What term describes a selection of observations taken from a subset of the population?

    • Population
    • Census
    • Sample
    • Sampling frame

  3. In which sampling method does every member of the population have an equal selection chance?

    • Simple random
    • Stratified
    • Quota
    • Opportunity

  4. Which sampling method selects individuals who are available and willing at the time of study?

    • Opportunity
    • Stratified
    • Simple random
    • Systematic

  5. What is the main practical advantage of taking a sample instead of a census?

    • Includes every subject
    • Removes all bias
    • Saves time and cost
    • Guarantees total accuracy

  6. A survey uses 30 students in the canteen to represent the whole school. What is the main limitation?

    • Sampling frame missing
    • Sample is parameter
    • Calculation error
    • Risk of bias

  7. Two random samples from the same population give different sample means. What does this demonstrate?

    • Measurement error
    • Non-response bias
    • Sampling variability
    • Selection bias

  8. Selecting 90 students from a list of 900 using random numbers is an example of which technique?

    • Quota
    • Simple random
    • Opportunity
    • Stratified

  9. A study measures adult heights in a town. What constitutes the target population?

    • All UK adults
    • Only sample participants
    • All town children
    • All town adults

  10. Which of these measures is a statistic rather than a population parameter?

    • Sample mean
    • Population variance
    • Population standard deviation
    • Population mean

  11. A fitness survey emails only members of a gym. What is the primary limitation of this survey?

    • Calculation error
    • Too many respondents
    • Sampling bias
    • Parametric error

  12. How can you reduce bias when taking an opportunity sample?

    • Increase sample size
    • Vary sampling times
    • Sample friends only
    • Use smaller groups

  13. A population has 2000 members and a simple random sample of 100 is taken. What is the probability that a given member is selected?

    • 1/2000
    • 1/100
    • 1/10
    • 1/20

  14. A group of 6 pupils is available. How many different samples of 2 pupils can be chosen, with order ignored?

    • 15
    • 30
    • 12
    • 36

  15. A population has mean 50. Four samples have means 48, 52, 49 and 51. What is the mean of these sample means?

    • 52
    • 200
    • 48
    • 50

  16. What term describes systematically favouring certain population members during sampling?

    • Stratified sampling
    • Sampling error
    • Random variation
    • Selection bias

  17. A town has 40% of residents under 18. In a random sample of 200 residents, how many would be expected to be under 18?

    • 120
    • 40
    • 8
    • 80

  18. What is a list of all population members available for sampling called?

    • Sampling frame
    • Population parameter
    • Sampling unit
    • Sample size

  19. When is a census usually preferred over taking a sample from a population?

    • Large population
    • Destructive testing
    • Small population
    • Infinite population

  20. In a sample, the proportion is 0.62. What is the best estimate for the population proportion?

    • 62
    • 0.062
    • 0.62
    • 0.38

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