Sapling Learning Map do Determine the precision and accuracy of these data for t

Question

Sapling Learning Map do Determine the precision and accuracy of these data for thallium. Sample1 Sample 2 Sample 3 Known concentration: 23.9 ng/mL 83.9 ng/mL 239 ng/mL Experimentally determined values: 20.3 (ng/mL) 78.3 64.5 245 231 35.2 25.6 22.4 22.3 26.5 77.1 209 - 1 1201 96.4 76.0 79.1 255 227 Sample 1 Precision Rel Std Deviation) Sample 2 Precision (Rel Std Deviation) Sample 3 Precision (Rel Std Deviation) Number Number Number Sample 3 Accuracy Relative Error) Number Sample 2 Accuracy Sample 1 Accuracy Relative Error) Number Number

Explanation / Answer

From the given data

Sample 1 Precision

mean = 25.2

standard deviation = 4.5

Relative standard deviation = 17.9%

Sample 1 Accuracy

Actual error = sum(sample/mean)/7 = 1.02

Reltive error = 1.02 x 100/25.2 = 4.05%

Sample 2 Precision

mean = 79.6

standard deviation = 9.1

Relative standard deviation = 11.4%

Sample 2 Accuracy

Actual error = sum(sample/mean)/7 = 1.0

Reltive error = 1.0 x 100/79.6 = 1.3%

Sample 3 Precision

mean = 229.6

standard deviation = 17.8

Relative standard deviation = 7.7%

Sample 3 Accuracy

Actual error = sum(sample/mean)/7 = 1.06

Reltive error = 1.06 x 100/229.6 = 0.5%

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