The means of the reported resultsare 685 c and 488 h at the, Chemistry

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The means of the reported resultsare 685 c and 488 h at the

To test the quality of the work of a commercial laboratory,duplicate analyses of a purified benzoic acid (68.8% C, 4.935% H)sample were requested. It is assumed that the relative standarddeviation of the method is sr ? s = 4 ppt forcarbon and 6 ppt for hydrogen. The means of the reported resultsare 68.5% C and 4.88% H. At the 95% confidence level, is there any indication of systematic error in either analysis?

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Chemistry: The means of the reported resultsare 685 c and 488 h at the

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