Social Studies, 12.08.2020 04:01 shanua

Researchers were interested in whether relaxation training works better than fitness training in decreasing the number of headaches a person experiences. They randomly assigned 20 participants either to the fitness training group or a relaxation training group and then recorded the change in number of headaches for each group from pre-training to post-training. The independent variable in this study is ___.

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Researchers were interested in whether relaxation training works better than fitness training in dec...