ATI RN
Epidemiology Test Questions and Answers PDF Questions
Question 1 of 5
Which of the following is an example of an observational study?
Correct Answer: B
Rationale: Cohort studies (B) are observational, tracking natural exposure-outcome links. A and D are experimental, C is lab-based.
Question 2 of 5
Which of the following can help control confounding in an epidemiological study?
Correct Answer: D
Rationale: All methods (D) control confounding: randomization (A) balances variables, blinding (B) reduces bias, matching (C) pairs on confounders (e.g., age). Combined, they’re effective.
Question 3 of 5
What is the primary way to reduce information bias in a study?
Correct Answer: B
Rationale: Blinding (B) reduces information bias by masking status (e.g., double-blind trials). A, C, and D address other issues.
Question 4 of 5
Sensitivity of a diagnostic test is defined as:
Correct Answer: B
Rationale: Sensitivity (B) is true positives / (true positives + false negatives), detecting diseased (e.g., 90% sensitivity = 90% of sick identified). A is specificity, C is PPV, D is an error.
Question 5 of 5
Which of the following can improve the positive predictive value of a test?
Correct Answer: C
Rationale: Higher specificity (C) boosts PPV by reducing false positives (e.g., stricter test). A helps, B and D don’t directly.