Determine the precision and accuracy of these data for thallium. Sample 1 Sample

Question

Determine the precision and accuracy of these data for thallium. Sample 1 Sample 2 Sample 3 Known concentration:23.9 ng/mL 83.9 ng/mL 239 ng/mL 78.3 64.5 77.1 96.4 76.0 79.1 245 231 209 255 201 227 35.2 Experimentally determined values 20.3 (ng/mL) 25.6 22.4 22.3 26.5 Sample 1 Precision Rel Std Deviation) Sample 2 Precision (Rel Std Deviation) Number Sample 3 Precision (Rel Std Deviation) Number Number Sample 1 Accuracy (Relative Error) Sample 2 Accuracy Relative Error) Sample 3 Accuracy Relative Error) Number Number Number

Explanation / Answer

relative standard deviation, RSD = 100S /xbar

The formula is: REaccuracy = (Absolute error / “True” value) * 100%

excel formulation

1 2 3 35.2 78.3 245 20.3 64.5 231 25.6 77.1 209 22.4 96.4 255 22.3 76 201 26.5 79.1 227 sample mean 25.38333 78.56667 228 sd 5.327445 10.24689 20.58155 known mean 23.9 83.9 239 precision 20.98796 13.04228 9.026993 accuracy 6.206416 6.356774 4.60251

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