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How do you find Absolute error and how do you find relative error?

Absolute error is the difference between the experimental value and the actual value. Relative error, usually expressed as a percent, is the error relative to the correct value. For example,
We perform an analysis on a sample for Na. We find 34.0%. We turn in the results and the instructor tell us she made the samples and they were 36.0% Na. Absolute error is xexp - xtrue = 34.0-36.0= -2.0%.

Same values as above.
relative error = [(34.0-36.0)/36.0]x100=5.56%

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