To test the quality of the work of a commercial laboratory, duplicate analyses of a purified benzoic acid (68.8% C, 4.953% H) sample were requested. It is assumed that the relative standard deviation of the method is s, → o = 4 ppt for carbon and 6 ppt for hydrogen. The means of the reported results are 68.5% C and 4.882% H. At the 95% confidence level, is there any indication of systematic error in either analvris?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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To test the quality of the work of a commercial laboratory, duplicate analyses of a
purified benzoic acid (68.8% C, 4.953% H) sample were requested. It is assumed that the
relative standard deviation of the method is s, → o = 4 ppt for carbon and 6 ppt for
hydrogen. The means of the reported results are 68.5% C and 4.882% H. At the 95%
confidence level, is there any indication of systematic error in either analysis?
Transcribed Image Text:To test the quality of the work of a commercial laboratory, duplicate analyses of a purified benzoic acid (68.8% C, 4.953% H) sample were requested. It is assumed that the relative standard deviation of the method is s, → o = 4 ppt for carbon and 6 ppt for hydrogen. The means of the reported results are 68.5% C and 4.882% H. At the 95% confidence level, is there any indication of systematic error in either analysis?
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