A Solomon four-group design is useful for addressing issues of internal validity.

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A Solomon four-group design is useful for addressing issues of internal validity by allowing researchers to investigate the potential influence of pre-existing differences or sensitization effects on their results. This design includes four groups of participants: one group receives pre-test and post-test measures, another group only receives post-test measures, a third group only receives pre-test measures, and a fourth group does not receive any measures. By comparing the results of each group, researchers can determine if any observed changes in the experimental group's post-test scores are due to the intervention or other factors.

A Solomon Four-Group Design Is Useful for Addressing Issues of Internal