What is unique about the experimental design of an observational study?
2 answers:
The correct answer will stress the differences between the observational study and experimental study - and options a), c) and d) can be true of both.
The correct answer is:
b. Experimental subjects are left free of manipulation
-this is the major difference between the observation and experiment.
For APEX, the answer is b "Experimental subjects are left free of manipulation."
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