analytical chem An atomic absorption method for the determination of amount of F

Question

analytical chem

An atomic absorption method for the determination of amount of Fe present in used jet engine oil was found from pooling 30 triplicate analyses, to have a standard deviation s rightarrow sigma = 2.5 mug Fe/mL. Calculate the 80% and 95% confidence limit for the result 18.5 mug Fe/mL if it was based upon (a) single analysis (b) mean of 2 analyses (c) mean of 4 analyses. How many replicate measurements are needed to decrease the 80% and 95% confidence interval for analysis above to plusminus 1.5 mug Fe/mL?

Explanation / Answer

You should have the results of practicle to obtain mean values..

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