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Behavioral Sciences and Biostatistics

Biostatistics: Mean, Median, Risk Ratios Practice Questions

20 free Biostatistics: Mean, Median, Risk Ratios practice questions for the USMLE Step 1, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All Biostatistics: Mean, Median, Risk Ratios questions

20 questions
  1. Q1. A dataset has the following values: 2, 3, 3, 4, 10. Which measure of central tendency is most affected by the extreme value?
  2. Q2. In a positively skewed distribution, which relationship between mean, median, and mode is expected?
  3. Q3. A study reports that smokers have a lung cancer incidence of 30 per 1,000, while nonsmokers have 5 per 1,000. What is the relative risk?
  4. Q4. A screening test incorrectly labels many healthy people as having a disease. Which statistic is reduced?
  5. Q5. Which measure is most appropriate for describing the central value of ordinal data such as pain scales?
  6. Q6. A researcher reports that the median age of patients is 37. What does this imply?
  7. Q7. A high standard deviation in a dataset indicates:
  8. Q8. A cohort study finds a relative risk of 1.0. What does this indicate?
  9. Q9. A case-control study reports an odds ratio of 4. This means:
  10. Q10. The interquartile range (IQR) represents the:
  11. Q11. A distribution has mean = 10 and median = 5. Which statement is most likely?
  12. Q12. A test with high sensitivity is most useful for:
  13. Q13. A disease has a prevalence of 5%. Which value is most directly affected by prevalence?
  14. Q14. If the variance of a dataset is 16, the standard deviation is:
  15. Q15. A researcher wants to reduce the margin of error in an estimate. Which change helps achieve this?
  16. Q16. A screening test has a sensitivity of 95% and specificity of 20%. Which consequence is likely?
  17. Q17. In a normally distributed dataset, approximately what proportion lies within 2 standard deviations of the mean?
  18. Q18. A test’s negative predictive value increases when:
  19. Q19. A researcher compares the mean blood pressure of two independent groups. Which statistical test is most appropriate?
  20. Q20. Relative risk is most appropriately calculated in which study design?