In clinical trials involving tests of new medical treatments,it may be extremely difficult to get patients to agree to be randomly assigned to either the treatment or the control group.In these situations researchers can use

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Quasi-experimental designs are used when researchers face limitations in assigning participants to different conditions randomly. In the context of clinical trials where patients may not agree to be randomly assigned to treatment or control groups, quasi-experimental designs allow researchers to study the effects of treatments without random assignment, thus accommodating the practical ethical constraints they face.

In Clinical Trials Involving Tests of New Medical Treatments,it May