Examination for Professional Practice of Psychology (EPPP) Practice Test

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Prepare for the Examination for Professional Practice of Psychology with our comprehensive practice test that includes detailed questions and answers, effective study strategies, and insights into the exam format. Get ready to elevate your psychology career!

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The Solomon four-group design is primarily used to evaluate what aspect in a research study?

internal validity only
external validity only
internal and external validity
statistical conclusion validity

The correct answer is: internal and external validity

The Solomon four-group design is a robust experimental design that is primarily utilized to assess both internal and external validity in research studies. Internal validity refers to the extent to which a study can demonstrate a cause-and-effect relationship between the independent and dependent variables, without interference from confounding factors. By using multiple groups, including pretest and posttest measurements, the Solomon four-group design helps to control for potential pretest effects and ensures that the results can be attributed to the treatment itself rather than other variables. External validity, on the other hand, concerns the generalizability of the study's findings to broader populations and real-world settings. The inclusion of different groups in the Solomon design allows researchers to examine whether the results can be replicated in various contexts or across different populations. By simultaneously addressing both internal and external validity, this design provides a comprehensive approach to evaluating the reliability and applicability of research findings, making it a valuable tool in psychological research.