A psychologist designed a new treatment for depression. He predicted depressive symptoms would be lower post-treatment. The data follow. Calculate the difference for each subject, the mean difference, and the standard deviation of the difference.

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The Answer of A psychologist designed a new treatment for depression. He predicted depressive symptoms would be lower post-treatment. The data follow. Calculate the difference for each subject, the mean difference, and the standard deviation of the difference.

A Psychologist Designed a New Treatment for Depression