9.78 Twenty specimens of a slightly different steel from that used in Exercise 9.77 were observed and
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9.78 Twenty specimens of a slightly different steel from that used in Exercise 9.77 were observed and yielded Rockwell hardness measurements with a mean of 72 and a variance of 94. Estimate the difference between the mean hardness for the two varieties of steel in a 95% confidence interval.
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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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