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Accuracy vs. Precision

Accuracy vs. Precision. Accuracy. Accuracy = the extent to which a measured value agrees with a standard value Accuracy of a device must be checked Does it read a proper accepted value? Beware of Parallax – the apparent shift in position when viewed at a different angle.

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Accuracy vs. Precision

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  1. Accuracy vs. Precision

  2. Accuracy • Accuracy = the extent to which a measured value agrees with a standard value • Accuracy of a device must be checked • Does it read a proper accepted value? • Beware of Parallax – the apparent shift in position when viewed at a different angle.

  3. Example: Accuracy Who is more accurate when measuring a book that has a true length of 17.0 cm? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm

  4. Precision • Precision = the degree of exactness of a measurement that is repeatedly recorded. • Which set is more precise? 18.2 , 18.4 , 18.35 17.9 , 18.3 , 18.85 16.8 , 17.2 , 19.44

  5. Example: Precision Who is more precise when measuring the same 17.0 cm book? Susan: 17.0 cm, 16.0 cm, 18.0 cm, 15.0 cm Amy: 15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm

  6. Accuracy vs Precision Groupings Precise, not accurate Accurate, not precise Precise and accurate

  7. Accuracy vs. Precision Less Precise x Less Accurate More Accurate More Precise

  8. Accuracy vs Precision

  9. Accuracy vs. Precision High Accuracy High Precision High Precision Low Accuracy

  10. Can you hit the bull's-eye? Three targets with three arrows each to shoot. Both accurate and precise Precise but not accurate Neither accurate nor precise How do they compare? Can you define accuracy vs. precision?

  11. Graduated Cylinder – Meniscus and Parallax

  12. Why Is There Uncertainty? • Measurements are performed with instruments, and no instrument can read to an infinite number of decimal places • Which of the instruments below has the greatest uncertainty in measurement?

  13. Evaluate whether the following are precise, accurate or both. High Accuracy High Precision Low Accuracy Low Precision Low Accuracy High Precision

  14. Accuracy vs Precision http://ls.xenia.k12.oh.us/SafeVideos/Video.aspx?id=_LL0uiOgh1E

  15. ACCURACY VS. PRECISION GAME

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