SOLUTION: The breaking point of a cable has a standard deviation of 90 lbs. A rndom sample of 90 newly manufactured cables has a mean breaking strnegth of 1900 lbs. Based on tis sample, fi
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Question 137662: The breaking point of a cable has a standard deviation of 90 lbs. A rndom sample of 90 newly manufactured cables has a mean breaking strnegth of 1900 lbs. Based on tis sample, find a 95% confidnence interval for the true mean.
What is the lower limit of the 95% conidence interval
What is the upper limit of the 95% confidence internal
THan you
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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.
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