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April 19, 2014

Homework Help: stats

Posted by johnny on Tuesday, November 27, 2012 at 9:38pm.

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.
The average diameter of the pipes must not differ significantly from 2.52 mm. Is there enough evidence at
the 5% level of significance to conclude that the true average diameter differs from this amount? Conduct an
appropriate hypothesis test using (i) the p-value method, (ii) the rejection point method, and (iii) the confidence
interval method.

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