Lesson 2h.03

2h.03 Know that sample size has an impact on reliability and replication Quiz: Pearson Edexcel Statistics, Unit 2

20 questions

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Lesson 2h.03, Know that sample size has an impact on reliability and replication: 20 multiple choice questions for the Pearson Edexcel GCSE Statistics (1ST0), Unit 2: Processing, representing and analysing data, written with Revision Ninja.

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The 20 questions

  1. Which sample size yields the most reliable statistical conclusions?

    • Single values
    • Pilot samples
    • Larger samples
    • Smaller samples

  2. What is replication in statistical investigations?

    • Data cleaning
    • Averaging data
    • Random sampling
    • Repeating a study

  3. Why do conclusions from small samples vary more?

    • Chance variation
    • Fixed quotas
    • Data entry
    • High bias

  4. Why does collecting more data improve trustworthiness?

    • Errors cancel out
    • Speeds analysis
    • Removes all bias
    • Lowers cost

  5. What is true of results from larger sample sizes?

    • Always perfectly accurate
    • Cheaper to collect
    • More easily replicated
    • Completely bias free

  6. What is the main effect of increasing sample size on a proportion estimate?

    • More extreme results
    • Larger standard error
    • Higher data bias
    • Closer to true value

  7. What is a common sign of an unreliable statistical conclusion?

    • Clear charts
    • High response rate
    • Very small sample
    • Systematic method

  8. What must you comment on when a conclusion uses a small sample?

    • Population mean
    • High accuracy
    • Reduced reliability
    • Zero error

  9. Which survey sample size is more likely to give a similar result if repeated?

    • 2000 people
    • 0 people
    • 2 people
    • 20 people

  10. Which coin toss test gives a more reliable probability estimate?

    • 10 tosses
    • 5 tosses
    • 1 toss
    • 1000 tosses

  11. Which school test result provides a more reliable pass rate estimate?

    • 300 students
    • 5 students
    • 15 students
    • 1 student

  12. What action best ensures more reliable conclusions about a population?

    • Smaller pilot group
    • Single interview
    • Biased selection
    • Larger random sample

  13. What change most improves survey reliability when estimating a population mean?

    • Smaller sample size
    • Larger sample size
    • Fewer interviewers
    • Shorter survey time

  14. Between samples of size 10 and 1000, which sample mean is less variable?

    • Both equal
    • Neither
    • 10-sample mean
    • 1000-sample mean

  15. What does successfully replicating a study with a much larger sample add?

    • More bias
    • Lower reliability
    • Greater confidence
    • Zero variance

  16. Why does a larger sample reduce the impact of one unusual value?

    • Range becomes zero
    • Value is deleted
    • Averaged with more
    • Median is ignored

  17. Why is a survey with 4000 respondents more trusted than one with 40?

    • Faster collection
    • Zero error
    • No missing data
    • Higher precision

  18. What do consistent results from independent repeated samples suggest?

    • High bias
    • Pure luck
    • Not chance
    • Data error

  19. Which study estimate of a difference is generally more reliable?

    • Single trial
    • Larger study
    • Pilot study
    • Smaller study

  20. Can a very large sample size correct a biased sample selection?

    • No
    • Always
    • Yes
    • Sometimes

All Pearson Edexcel Statistics quizzes