uncertainty

# uncertainty - Calculating Percent Error and Uncertainty...

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Calculating Percent Error and Uncertainty 1) Accuracy refers to how close a measurement is to the true or accepted value. 2) Presision is a measure of how closely clustered a group of measurements of the same quantity are to each other. Errors in measurements are due to: 1) Systematic Errors --procedural errors made by the experimenter. They cause the measured value to deviate from the "accepted" value in the same direction i.e. always higher or always lower. Examples of causes include miscalibration of instruments and parallax errors. These errors can be detected and corrected. Systematic errors are calculated as Percent Error. AKA the accuracy of the work 2) Random Errors --these errors arise due to uncertainties in the measuring instruments. They result in measured values that are either too high or too low. They are found commonly in mass, volume and temperature readings. These errors cannot be determined and eliminated, however, they can be treated with statistics. The effect of these errors can be minimized by taking multiple measurements of the same thing so that the random errors cancel out. They are always written +/- Random errors are calculated as Uncertainty. No measured value can be determined exactly!!! Every measurement contains some degree of uncertainty. The uncertainty is typically +/- 1 in the last decimal place of the measurement and is often given on the measuring instrument. EXAMPLE

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uncertainty - Calculating Percent Error and Uncertainty...

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