Which of the Following Statements Is/are True About Case-Control Designs?​

question 1

Multiple Choice

Which of the following statements is/are true about case-control designs?​

• A) ​They are rarely feasible.
• B) Data must be collected at multiple points in time.​
• C) Retrospective data are collected about past differences that might explain differences in outcome.​
• D) We can usually be highly confident about their internal and external validity.​
• E) ​We can usually be highly confident about the direction of causal influence.

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