Question: 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

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 mg Fe/mL. If s is a good estimate of u, calculate the 95 and 99% confidence intervals for the result 18.5 mg Fe/mL if it was based on
(a) A single analysis,
(b) The mean of two analyses,
(c) The mean of four analyses.

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