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11 Dec 2019
An atomic absorption method for determination of copper in fuelsyielded a standard deviation of s=0.32µg Cu/mL. The analysis of anoil from a reciprocating aircraft engine showed a copper content of8.53µg Cu/mL. (a) Calculate the confidence interval at 95%confidence level for the result if it was based on the mean of 4analyses.
(b) How many replicate measurements are needed to decrease theconfidence interval at 95% confidence level to 0.2µg Cu/mL.
An atomic absorption method for determination of copper in fuelsyielded a standard deviation of s=0.32µg Cu/mL. The analysis of anoil from a reciprocating aircraft engine showed a copper content of8.53µg Cu/mL. (a) Calculate the confidence interval at 95%confidence level for the result if it was based on the mean of 4analyses.
(b) How many replicate measurements are needed to decrease theconfidence interval at 95% confidence level to 0.2µg Cu/mL.
Trinidad TremblayLv2
13 Dec 2019
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