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 3.1 g Fe/mL. If s is a good estimate of o, calculate the 95 and 99% confidence intervals for the result 21.7 g Fe/mL if it was based on the following criteria. - (a) a single analysis 95% confidence interval= 21.7 99% confidence interval = 21.7 (b) the mean of two analyses 95% confidence interval = 21.7 99% confidence interval= 21.7 (c) the mean of six analyses 95% confidence interval = 21.7 99% confidence interval = 21.7 g Fe/mL ug Fe/mL g Fe/mL ug Fe/mL g Fe/mL g Fe/mL