A design in which the differential impacts of at least two treatments are compared,and a no-treatment control group may or may not be included is known as an)

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A comparative treatment study compares at least two treatments and may or may not include a no-treatment control group. This type of design allows for examining differential impacts between treatments. While mixed designs can also compare treatments, they typically include other variables such as pre- and post-treatment measures, and are not solely focused on comparing treatments. Higher-order treatment outcome studies and effectiveness trials are not specific designs for comparing treatments.

A Design in Which the Differential Impacts of at Least