Psychologists and epidemiologists would agree that which type of study is the most desirable design,the "gold standard" of scientific research?

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Randomized, placebo-controlled, double-blind trials are considered the "gold standard" of scientific research in psychology and epidemiology. This type of study involves randomly assigning participants to either a treatment group or a control group, with neither the researchers nor the participants knowing which group they are in (double-blind). The treatment group receives the intervention being tested while the control group receives a placebo. This design reduces bias and increases the likelihood that any observed effects are due to the intervention rather than other factors.

Psychologists and Epidemiologists Would Agree That Which Type of Study