Question: Why do randomized experiments in general produce a higher level of evidence than observational research? (a)Because randomized experiments are expensive and well controlled (b)Because randomization

Why do randomized experiments in general produce a higher level of evidence than observational research?

(a)Because randomized experiments are expensive and well controlled

(b)Because randomization controls for unmeasured confounders

(c)Because randomized experiments are closer to real life.

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