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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?

    thanks
     
  2. jcsd
  3. Jan 29, 2012 #2

    mathman

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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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