Which of the following is not a problem associated with observational...

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

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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