Which of the following is not a problem associated with observational studies? Options: A . &nbspThe main conclusion may be invalid because of the confounding effects of uncontrolled variables B . &nbspEstimates may be biased because of non-random sampling C . &nbspObservations have to be taken on groups of individuals rather than on individuals themselves D . &nbspNone of the above

Which of the following is not a problem associated with observational studies?

Question

Which of the following is not a problem associated with observational studies?

Options:

A . The main conclusion may be invalid because of the confounding effects of uncontrolled variables

B . Estimates may be biased because of non-random sampling

C . Observations have to be taken on groups of individuals rather than on individuals themselves

D . None of the above

Answer: Option D
None of the above

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