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A medication manufacturer claims their meds reduce depressive symptoms by 10 points, with a standard deviation of 2 points. I think it is probably not

A medication manufacturer claims their meds reduce depressive symptoms by 10 points, with a standard deviation of 2 points. I think it is probably not that good. I collect data and find that in my sample symptoms are reduced by 6 points. Find the Z score and tell me whether or not I can reject the manufacturer claim

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