9.75 The diameter measurements of an armored electric cable, taken at 10 points along the cable, yield
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9.75 The diameter measurements of an armored electric cable, taken at 10 points along the cable, yield a sample mean of 2.1 centimeters and a sample standard deviation of 0.3 centimeter.
Estimate the average diameter of the cable in a confidence interval with a confidence coefficient of 0.90. What assumptions are necessary for your answer to be valid?
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Related Book For 
Probability And Statistics For Engineers
ISBN: 9781133006909
5th Edition
Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr
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