Quantitative analysis student analyzed an ore sample for copper content and obtained a mean of 4.67% Cu for 3 measurements. How many additional measurements must Kenny make to obtain a mean that is 5 times more reliable?

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Elin HesselLv2

31 Dec 2019

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An atomic absorption method for determination of copper in fuelsyielded a standard deviation of s=0.32Âµg Cu/mL. The analysis of anoil from a reciprocating aircraft engine showed a copper content of8.53Âµg Cu/mL. (a) Calculate the confidence interval at 95%confidence level for the result if it was based on the mean of 4analyses.
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