Studies where one group gets an experimental drug and another gets a placebo are called:

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Randomized clinical trials are experiments in which participants are randomly assigned to receive either the experimental treatment or a placebo. This is an important design for testing the efficacy and safety of new drugs and treatments. Correlational studies examine the relationship between variables but do not manipulate them. Quasi-experimental studies are not true experiments because participants are not randomly assigned and there is no control group. Longitudinal studies follow participants over time but do not necessarily involve an experimental treatment.

Studies Where One Group Gets an Experimental Drug and Another