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 µg Fe/mL. If s is a good estimate of o, calculate the 95 and 99% confidence intervals for the result 21.7 μg 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 ± μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL
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 µg Fe/mL. If s is a good estimate of o, calculate the 95 and 99% confidence intervals for the result 21.7 μg 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 ± μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL
Chapter2: Basic Statistical Analysis With Excel
Section: Chapter Questions
Problem 10P
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