When studying the effect (efficacy) of a medication, researchers will give some subjects doses of the medication under study and others an inactive or inert doses to see the relative effect of the medication.
This known as a 'blind study' because the participants do not know know whether they received the medication or the inert dose.
A 'double blind study' is when a third party designs the experiment and prepares the doses so that neither the subject or the scientist doing the testing knows which is getting the live dose.
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