what is double-blind tests?

Question

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Answer 1

Double-blind tests mean that neither the participants nor the investigators know which group an individual is placed in. For example, say you are testing a new drug in a double blind test. The investigators do not know who received the drug and who received the placebo and the participants also do not know if they received the drug or the placebo.

Answer 2

Let’s take the example of testing a new drug vs. a placebo in patients. Double-blind means that neither the patient or the doctor knows which medication (active drug or dummy placebo) is being given to the patient.

A single blind study would be the case where the doctor, but not the patient knows.

Double-Blind studies are important when the study outcome might be affected by knowledge of whether a patient receives the active drug or placebo, most usually for affecting any behavioral outcome ( eg., sedation, sleep, depression, etc).