10.26 Yield stress measurements on 51 steel rods with 10 mm diameters gave a mean of 485...
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10.26 Yield stress measurements on 51 steel rods with 10 mm diameters gave a mean of 485 N/mm2 and a standard deviation of 17.2. (See Booster, Journal of Quality Technology, 1983, for details.) Suppose the manufacturer claims that the mean yield stress for these bars is 490.
Does the sample information suggest rejecting the manufacturer’s claim, at the 5% significance level?
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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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