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Which of the following is part of a observational study? Placebo Treatment Control Group Variable of interest

Which of the following is part of a observational study? Placebo Treatment Control Group Variable of interest
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Which of the following is part of a observational study?

Placebo
Treatment
Control Group
Variable of interest

asked
User X Pahadi
by
9.6k points

1 Answer

3 votes
B. Treatment.
I do not know what Placebo is, though, so before you put this answer, please explain it to me.
answered
User Fatih BAKIR
by
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