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How to i combine uncertainties

  1. Jan 29, 2012 #1
    i have a measurement which has random uncertainty of 0.02 and scale reading 0.01. how do i combine these uncertainties - add in quadrature the percentage uncertainty or the absolute uncertainty? and does this give the percentage uncertainty or the absolute uncertainty of my measurement?

  2. jcsd
  3. Jan 29, 2012 #2


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    Science Advisor

    If both uncertainties are random and independent, add the squares of the absolute uncertainties and take the square root.
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