1d.02 Know the importance of reliability and validity with regards to collected data Quiz: Pearson Edexcel Statistics, Unit 1

The 20 questions

1. What term describes the extent to which repeated measurements yield similar results?

   • Bias
   • Sensitivity
   • Reliability
   • Validity

2. What term describes the extent to which a test measures what was intended?

   • Precision
   • Validity
   • Reliability
   • Accuracy

3. Bathroom scale readings of 80kg, 80kg and 81kg for the same person show what?

   • High reliability
   • High validity
   • Data bias
   • Poor reliability

4. A questionnaire meant to measure attitudes asks only about income. Which problem is this?

   • Low validity
   • Large sample
   • High reliability
   • Poor sampling frame

5. Which action directly improves the reliability of a measurement?

   • Varying timing
   • Standard procedure
   • Changing method
   • Single reading

6. Which action directly improves the validity of a measurement?

   • Assessing correct concept
   • Repeating tests
   • Using random digits
   • Increasing sample size

7. Which statement regarding data quality measures is always true?

   • Reliability equals validity
   • Validity guarantees bias
   • Reliable without validity
   • Valid without reliability

8. Which measurement tool would likely have the lowest reliability?

   • Digital counter
   • Standard ruler
   • Calibrated scale
   • Inconsistent stopwatch

9. What do repeatedly close measurements of the same object demonstrate?

   • Accuracy
   • Bias
   • Validity
   • Reliability

10. A maths ability test uses only reading passages. Which concept is at risk?

    • Validity
    • Sample size
    • Reliability
    • Sampling frame

11. A survey gets almost the same answers when repeated a week later. Which is shown?

    • Census error
    • Bias
    • Reliability
    • Validity

12. A survey on eating habits gives very different answers when the same people are asked again. What is the likely problem?

    • Low reliability
    • A census error
    • Strong correlation
    • High validity

13. What primary issue arises when a measurement tool consistently records values above the true amount?

    • Low reliability
    • Systematic bias
    • High validity
    • Random error

14. A researcher checks whether a reaction time test measures reaction and not memory. Which concept is being checked?

    • Stratification
    • Reliability
    • Validity
    • Sampling frame

15. What is the primary statistical reason for repeating measurements?

    • To check reliability
    • To remove bias
    • To clean data
    • To ensure validity

16. If two markers give very close scores for the same essays, what is established?

    • High validity
    • Zero bias
    • Complete accuracy
    • High reliability

17. What is the status of a consistent test that measures eyesight instead of reaction time?

    • Unreliable and invalid
    • Valid but unreliable
    • Reliable and valid
    • Reliable but invalid

18. Why does a large sample size alone fail to guarantee valid data?

    • Measures incorrectly
    • Lacks precision
    • Reduces reliability
    • Causes bias

19. What is the best action when a data collection measure has high reliability but low validity?

    • Increase sample size
    • Ignore the results
    • Change the population
    • Review the measure

20. Which term describes a measure that is accurate on average but varies widely when repeated?

    • Valid and reliable
    • Reliable but invalid
    • Unreliable and invalid
    • Valid but unreliable

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