The participants in a wait list control group receive the treatment:

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A wait list control group is typically used when it is not ethical or practical to deny participants access to a treatment. The group is assigned to a later start date for the treatment, so they are not receiving the treatment at the same time as the experimental group (B) or before the experimental group (A). The wait list control group serves as a comparison to the experimental group, which allows researchers to measure the treatment's effectiveness.

The Participants in a Wait List Control Group Receive the Treatment