Homework Help: Stats

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.

Stats - PsyDAG, Wednesday, November 28, 2012 at 11:54am
95% = mean ą 1.695 SEm

SEm = SD/√n

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