An atomic absorption method for the determination of the amount of iron present in used jet engine oil was found from pooling 30 triplicate analyses to have a standard deviation s = 3.6 µg Fe/mL. If s is a good estimate of σ, calculate the 95 and 99% confidence intervals for the result 18.5 µg Fe/mL if it was based on
(a) a single analysis,
(b) the mean of two analyses, and
(c) the mean of four analyses.
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