A pie company claims that the number of pies it sells daily, Ask an Expert

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A pie company claims that the number of pies it sells daily is 1600. The President of the company wants to test the accuracy of this claim. He finds a random sample of 36 days' sales shows that the average daily sales were 1500 pies. Using a signifigance level of alpha = 0.01 and assuming that sigma is 120 pies, what should the president conclude?

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