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 group (P = 0.50)." The P-value refers to a null hypothesis of "no change" in measurements between pallidal stimulation. Explain clearly why this value provides no evidence of change.
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If P = 0.50, it is indicating that the difference would be found 50% of the time solely by chance.
THE NULL ALWAYS STATED THAT THERE IS NO RELATION BETWEEN THE TWO VARIABLES.
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