CH204_L04 - Error and Uncertainty Error: The difference...

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Error and Uncertainty Error: The difference between your answer and the “true” one. Systematic (determinant) Error Error associated with a method or equipment flaw. All errors are same size, magnitude and direction. In principle these errors can be discovered and corrected. Ex: miscalibrated meter. Random (indeterminant) Error Based on limits and precision of measurement. Can be treated with statistics. Ex: random electrical noise Gross Error Errors caused by committing a personal faux pas or fault . AKA : boo boo, blooper, bungle, foul-up, flub, botch, sin, boob, goof, botch, fumble, botch up, muff, blow, flub, screw up, spoil, muck up, fluff, bollix, bollocks, Other expletives! Best to redo measurement! Ex: many come to mind!
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() 1 2 = = N x x s N n i i 100 × x s Precision: Agreement between two or more measurements that have been carried out in exactly the same fashion. Sample S. D. Accuracy Closeness of measurement or set of measurements to the accepted value. Expressed in terms of error. –Absolute error E = x i –x t x t = true value –Relative error E r = ((x i –x t )/x t ) x 100 (% relative error) Goal: Accurate values that agree well with each other!
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This note was uploaded on 02/28/2010 for the course CH 52470 taught by Professor Appling during the Spring '10 term at University of Texas at Austin.

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CH204_L04 - Error and Uncertainty Error: The difference...

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