Question

Which of the following is a common source of error in a large case-control study?

Answer 1

Answer: Error in Reporting or Recall

Explanation: Subjects do not remember their past exposure.

Answer 2

Selection bias is a common source of error in a large case-control study. This occurs when the selection of controls does not accurately reflect the population from which the cases arose, leading to non-comparable groups and potentially biased results.