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A national perfume manufacturer, claims that the cost of processing a sales order is $12.50. In...

A national perfume manufacturer, claims that the cost of processing a sales order is $12.50. In order to test this belief it obtains a random sample of 40 orders and finds the mean processing cost is $12.75 with a population standard deviation of $0.50. Test the claim at the 0.01 level of significance.

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