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error_analysis - Error Analysis Expressing uncertainty in...

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Error Analysis Expressing uncertainty in measurements of physical properties
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Types of Errors Systematic Errors All Errors in Same Direction Instrumental bias Misreading/misuse of instrument – Miscalibration – Contamination Random Errors Errors in Different Directions Intrinsic limitations of instrument/measurement sensitivity Limitations of ability to interpret output Mechanical/electronic limitations –e.g., stability Model Errors Flawed assumption in experimental design
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Examples Balance not tared Reading wrong scale on gauge Determine molar mass (MM) of a gas from the relationship MM = (m/V)(RT/P) Stopwatch timing of events Unsuspected background peak in spectrum
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