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Social Studies, 18.08.2021 01:10 carlosgc19

A research study finds that a group of participants who received relaxation training had lower test anxiety scores than a group who did not receive the training. However, the researcher suspects that the difference between groups may be caused by the fact that the participants in one group are generally smarter than those in the other. This study has a problem with: A. correlational validity
B. internal validity
C. external validity
D. experimental validity

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