Multiple Choice
In prospective observational studies,we use "d" to stand for
A) the difference in the frequency of an effect in the experimental group and the control group.
B) the difference in the frequency of a suspected cause in the experimental group and the control group.
C) the data accumulated from the control group.
D) the data accumulated from the experimental group.
E) dirty equipment.
Correct Answer:

Verified
Correct Answer:
Verified
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