Observational studies are sometimes referred to as natural experiments. Explain

Question

Observational studies are sometimes referred to as natural experiments. Explain what this means. Choose the correct answer below. A. In an observational study subjects are paired up according to a similarity. B. In an observational study, subjects are assigned to different treatments groups through random selection. C. In an observational study, a treatment is applied to part of a population and responses are obvserved. D. In an observational study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions.

Explanation / Answer

Answer is option D

i.e. inn observational study, a researcher measures characteistics of interest of a part of a populationbut does not change existing conditions.

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