What kind of study is the Observational study?

I really wish that someone could answer me, what is Observational study?
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"A study in which the assignment of elements to different treatments is voluntary, and the researcher simply ob-serves the results of the study."
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Inside epidemiology along with statistics, the experimental research attracts implications around the doable impression of your intervention upon subjects, the location where the work involving themes in to a taken care of class as opposed to the manage team is outside the management of the actual private investigator
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