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A(n)_____________ is an investigation in which a group that receives some experimental treatment is compared to a group that does not receive the experimental treatment.
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A(n)_____________ is an investigation in which a group that receives some experimental treatment is compared to a group that does not receive the experimental treatment.

User Kevin Ding
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A clinical trial is this type of investigation.
User ForOhFor
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A control group is an investigation in which a group that receives some experimental treatment is compared to a group that does not receive the experimental treatment
User Homayoun
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