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Difference between the proportions of all orders

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A mail-order company has two warehouses, one on the West Coast and the second on the East Coast. The company's policy is to mail all orders placed with it within 72 hours. The company's quality control department checks quite often whether or not this policy is maintained at the two warehouses. A recently taken sample of 400 orders placed with the warehouse on the West coast showed that 368 of them were mailed within 72 hours. Another sample of 300 orders placed with the warehouse on the East Coast showed that 285 of them were mailed within 72 hours.

a. Construct a 97% confidence interval for the difference between the proportions of all orders placed at the two warehouses that are mailed within 72 hours.

b. Interpret the results of the confidence interval.

Reference no: EM131058129

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