Question: Identify a true statement about randomized experimental studies. Group of answer choices It starts with a group of people that already exhibits a certain effect.

Identify a true statement about randomized experimental studies. Group of answer choices It starts with a group of people that already exhibits a certain effect. It is a type of uncontrolled study. It begins with a group of people that has already been exposed to a suspected causal agent. It is sometimes not possible to conduct studies of this kind due to ethical reasons

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