Discussion :: Teaching and Research
- Which of the following is not a problem associated with observational studies?
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A.
The main conclusion may be invalid because of the confounding effects of uncontrolled variables |
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B.
Estimates may be biased because of non-random sampling |
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C.
Observations have to be taken on groups of individuals rather than on individuals themselves |
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D.
None of the above |
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Answer : Option D
Explanation :
None of the above
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