When experiments are used to determine whether therapy is effective, the therapy can be deemed effective only if the

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In order to determine whether therapy is effective, the experimental group must show more improvement than the control group. This allows for a comparison between the group receiving the therapy and the group not receiving the therapy, ensuring that any improvements are actually due to the therapy itself and not some other factor. If the control group were to improve or the waiting-list group were to improve dramatically, it would be more difficult to ascertain whether the therapy was truly effective.

When Experiments Are Used to Determine Whether Therapy Is Effective