Errors in chemical analysis The concentration of nitrate in a standard sample were measured by lab-1 and the results of the replicates are shown below. Knowing that the true value is 3.40 ppm Lab-1: 3.23, 3.21, 3.29, 3.25 ppm a. Complete the table. Mean Standard Median spread Coefficient of Percent deviation variation relative error b. Another lab (Lab-2) did the same measurements on the same sample with an average of 3.44 and standard deviation of 0.075. Which laboratory gave results that: were more accurate? Justify were more precise? Justify
Errors in chemical analysis The concentration of nitrate in a standard sample were measured by lab-1 and the results of the replicates are shown below. Knowing that the true value is 3.40 ppm Lab-1: 3.23, 3.21, 3.29, 3.25 ppm a. Complete the table. Mean Standard Median spread Coefficient of Percent deviation variation relative error b. Another lab (Lab-2) did the same measurements on the same sample with an average of 3.44 and standard deviation of 0.075. Which laboratory gave results that: were more accurate? Justify were more precise? Justify
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
Transcribed Image Text:Errors in chemical analysis
The concentration of nitrate in a standard sample were measured by lab-1 and the results of the
replicates are shown below. Knowing that the true value is 3.40 ppm
Lab-1: 3.23, 3.21, 3.29, 3.25 ppm
a. Complete the table.
Mean
Standard
deviation
Coefficient of
variation
Median
spread
Percent
relative error
b. Another lab (Lab-2) did the same measurements on the same sample with an average of
3.44 and standard deviation of 0.075. Which laboratory gave results that:
were more accurate?
Justify
were more precise?
Justify
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