<PRE><B>Question 137662</B>
The breaking point of a cable has a standard deviation of 90 lbs.  A random sample of 90 newly manufactured cables has a mean breaking strength of 1900 lbs.  Based on tis sample, find a 95% confidnence interval for the true mean.
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x-bar = 1900
E = 1.96[90/sqrt(90)] = 18.5942
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What is the lower limit of the 95% confidence interval: 1900-18.5942=1881.4058
What is the upper limit of the 95% confidence internal: 1900+18.5942=1918.5942
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Cheers,
Stan H.</PRE>