A randomized comparative experiment compared the effects of two types of deep-brain stimulation (pallidal stimulation and subthalamic stimulation) on…

A randomized comparative experiment compared the effects of two types of deep-brain stimulation (pallidal stimulation and subthalamic stimulation) on change in motor function, as blindly assessed on the Unified Parkinson’s Disease Rating Scale, part III (UPDRS-III). The abstract of the study said: “Mean changes in the primary outcome did not differ significantly between the two study groups (p = 0.50).” The p-value refers to a null hypothesis of “no change” in measurements between pallidal stimulation and subthalamic stimulation. Explain clearly why this p-value provides no evidence of change.

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