A psychologist designs a study to investigate the effect of diaphragmatic breathing on test anxiety. After recruiting test-anxious subjects, the researcher splits the group so that two equivalent groups are created. One group is taught the method of breathing and asked to use it before taking a verbal memory test, while the other group is not taught the technique. After scoring the tests and conducting a statistical test, the researcher finds that the group that received the training significantly outperformed the other group. In this design, the test scores for each group would be

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The dependent variable in this study is the test scores, as they are being measured to see if they change based on the use of diaphragmatic breathing. The independent variable is whether or not the group received the training. Correlation is not relevant to this design, and the test scores are not considered random.

A Psychologist Designs a Study to Investigate the Effect of Diaphragmatic