ATI RN
Epidemiology Question Bank Questions
Question 1 of 5
In a cross-sectional study, what is measured?
Correct Answer: B
Rationale: Cross-sectional studies (B) measure prevalence at one time (e.g., obesity rates). A requires time, C and D need longitudinal data.
Question 2 of 5
What is the main purpose of an observational study?
Correct Answer: B
Rationale: Observational studies (B) watch natural events (e.g., smoking-disease links). A and D are experimental, C is a byproduct.
Question 3 of 5
In a descriptive study, what type of data is typically collected?
Correct Answer: A
Rationale: Descriptive studies often collect qualitative data (A) to describe patterns (e.g., case reports), though quantitative (B) is also common. C and D are less typical.
Question 4 of 5
What type of bias occurs when the outcome influences the exposure classification?
Correct Answer: D
Rationale: Reverse causation bias (D) occurs when outcome affects perceived exposure (e.g., disease prompting recall). A is selection, B is broad, C is recall.
Question 5 of 5
Which of the following is a responsibility of the Institutional Review Board (IRB)?
Correct Answer: C
Rationale: IRBs (C) review protocols for ethics (e.g., consent, safety). A, B, and D are not their roles.