How many replicate measurements are necessary to decrease the 95 and 99% confidence limits for the analysis described in Problem to ± 0.20 µg Cu/mL?
Problem
An atomic absorption method for determination of copper in fuel samples yielded a pooled standard deviation of spooled = 0.27 µg Cu/mL (s → σ). The analysis of an oil from a reciprocating aircraft engine showed a copper content of 7.91 µg Cu/mL. Calculate the 95 and 99% confidence intervals for the result if it was based on
(a) a single analysis,
(b) the mean of 4 analyses, and
(c) the mean of 16 analyses.
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