7 8 9 10 12 14 15 t95% 2.45 2.37 2.31 2.26 2.21 2.17 2.15 1.96 1. The relative sampling standard deviation for the analysis of a metal in a water sample = 7.0%. If the mean is known to within of uncertainty is ± 4.0% [acceptable relative uncertainty]. How many samples must be analyzed to 95% confidence? (t = 1.96 for N = ). Note that Solving N is not straightforward because the t-value itself depends on N too!!The question is solved by iteration. %3D

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10
12
14
15
t95%
2.45
2.37
2.31
2.26
2.21
2.17
2.15
1.96
1. The relative sampling standard deviation for the analysis of a metal in a water sample = 7.0%. If
the mean is known to within of uncertainty is + 4.0% [acceptable relative uncertainty]. How many
samples must be analyzed to 95% confidence? (t = 1.96 for N = 0).
Note that Solving N is not straightforward because the t-value itself depends on N too!!The question
is solved by iteration.
Transcribed Image Text:7 10 12 14 15 t95% 2.45 2.37 2.31 2.26 2.21 2.17 2.15 1.96 1. The relative sampling standard deviation for the analysis of a metal in a water sample = 7.0%. If the mean is known to within of uncertainty is + 4.0% [acceptable relative uncertainty]. How many samples must be analyzed to 95% confidence? (t = 1.96 for N = 0). Note that Solving N is not straightforward because the t-value itself depends on N too!!The question is solved by iteration.
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