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The COCO Company makes washing machines. In one phase of production it is necessary to estimate...

The COCO Company makes washing machines. In one phase of production it is necessary to estimate the drying time of enamel paint on metal sheeting. Analysis of a random sample of 420 sheets shows that the average drying time is 56 hours with a standard deviation of 12 hours. Find a 99% confidence interval for the population mean.

Math   Statistics-And-Probability   
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