Question: Atomic absorption analysis for copper concentration in aircraft engine oil gave a value of 8.53gCu/ml. Pooled results of many analyses showed S=0.32 ugCu/ml. Calculate 90%

Atomic absorption analysis for copper concentration in aircraft engine oil gave

Atomic absorption analysis for copper concentration in aircraft engine oil gave a value of 8.53gCu/ml. Pooled results of many analyses showed S=0.32 ugCu/ml. Calculate 90% and 99% confidence limits if the above result were based on 4 and 16 neasurements

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