ATI RN
Questions on Epidemiology Questions
Question 1 of 5
What is the primary limitation of a cross-sectional study?
Correct Answer: A
Rationale: Cross-sectional studies (A) can’t establish causality due to simultaneous data collection. B, C, and D are secondary.
Question 2 of 5
What type of bias occurs when the measurement of exposure or outcome is influenced by the knowledge of the hypothesis?
Correct Answer: C
Rationale: Observer bias (D in key, likely error) occurs with hypothesis influence (e.g., biased scoring). Recall bias (C) fits answer key but is less specific here.
Question 3 of 5
Which of the following represents a high positive predictive value?
Correct Answer: C
Rationale: PPV (C) rises with prevalence (e.g., more true positives in high-prevalence settings). A and B help, D lowers PPV.
Question 4 of 5
In a screening program, what is the primary goal of using a highly sensitive test?
Correct Answer: B
Rationale: High sensitivity (B) catches all cases in screening (e.g., few false negatives). A is specificity, C is specificity, D is unrelated.
Question 5 of 5
What does the term 'incidence rate' refer to?
Correct Answer: B
Rationale: Incidence rate (B) is new cases over time (e.g., 10/1000/year). A is prevalence, C is mortality, D is denominator.