Q298
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
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
None of the above