Posted by **Matt** on Wednesday, November 28, 2012 at 2:59am.

The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to

estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of

2.56 mm with a standard deviation of 0.05 mm. You may assume that the diameters of the pipes are normally

distributed.

(A) Give a 95% confidence interval for the average diameter of pipes in this shipment.

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