Precision and Accuracy

• precision = reproducibility

  • check by performing several runs

• accuracy = correctness

  • check by using a different method

Analyst

1

2

3

4

Analysis of 5.00 ppm

Standard

5.01, 5.00, 5.02

5.10, 5.00, 4.90

4.80, 4.81, 4.82

4.50, 4.70, 4.90

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Hubble Space Telescope:

requested accuracy: 0.006 nm

delivered precision: 0.006 nm

accuracy: 0.06 nm