The determination of copper in a seawater sample gave a mean value of 77.81 mg/L and a ndard deviation ss of 1.74 mg/L. How many samples must be analyzed to obtain an acceptable ative uncertainty of 1.7% in the results at the 95% confidence level?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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7
6.
10
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t95%
2.45
2.37
2.31
2.26
2.21
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Transcribed Image Text:7 6. 10 12 14 15 t95% 2.45 2.37 2.31 2.26 2.21 2.17 2.15 1.96
2. The determination of copper in a seawater sample gave a mean value of 77.81 mg/L and a
standard deviation s; of 1.74 mg/L. How many samples must be analyzed to obtain an acceptable
relative uncertainty of 1.7% in the results at the 95% confidence level?
Transcribed Image Text:2. The determination of copper in a seawater sample gave a mean value of 77.81 mg/L and a standard deviation s; of 1.74 mg/L. How many samples must be analyzed to obtain an acceptable relative uncertainty of 1.7% in the results at the 95% confidence level?
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