Accuracy_versus_Precision__2_.ppt - Accuracy and Precision...

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Accuracy and and Precision Precision Understanding measurements
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Some mathematical STATEMENTS are 100% true (ex: I have 2 sisters, you are 14 years, 7 months, and 6 days old, etc.) But … every MEASUREMENT encounters ERROR. Understanding Error
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Examples of Measurement Error Vibrations, drafts, changes in temperature, electronic noise etc. Limitations of the measuring instrument
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Accuracy When dealing with data collection, we must describe the accuracy of the measurements
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Accuracy Is Correctness! how close your measurement is to the accepted value. A highly accurate measurement will be very close to the accepted value.
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Error ERROR is In correctness! The size of the experimental error can be described using mathematics: Absolute Error (or AE for short) shows how far away the measurement is from the accepted value Relative Error (or RE for short) turns the size of the error into a percentage .
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Formulas Absolute Error = | Accepted Value – Measured Value | Relative Error = | Absolute Error | x 100 Accepted Value
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  • Spring '17
  • mrs. Hornnibrook
  • Physics, pH, 6 days, 4 pounds, 6 pounds, 7 months, •Accuracy

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