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The national institute of diabetes and digestive and kidney diseases reports that the average cost of bariatric surgery is about $22500 with standard deviation of

The national institute of diabetes and digestive and kidney diseases reports that the average cost of bariatric surgery is about $22500 with standard deviation of $3015. You think this information is incorrect. You randomly select 30 bariatric surgery patients and find that the average cost for their surgeries is $21545. Is there enough evidence to support your claimant a=0.04?

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