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Homework Help: Error Analysis On Excel Questions

  1. Jan 28, 2008 #1
    1. The problem statement, all variables and given/known data

    The error part of my physics labs have been takin up a lot of time lately. Anyways, say I have 10 numbers for time measurements like 3.53 s, 5.32 s, 3.57 s, 4.89 s, 3.24 s, etc...
    and my reaction time is say +/- 0.20 s. I want to average these 10 values out but I have to associate an error reading like with the final value so for example my final value would like like : avg time = 3.23 +/- 0.13 s.

    How would I use Microsoft Excel to find that final error value? I know that I could find the standard deviation but that takes forever on paper, and what/how exactly would I propgate it with my reaction time?

    2. Relevant equations

    I think you'd have to use those statistics forumlas on Excel
  2. jcsd
  3. Jan 28, 2008 #2
    ok to rephrase it, say I find my standard deviation to be 0.08947 using Excel. My reaction time is 0.20 s and my average value is 1.41 s. How would I incorporate/propogate the rxn time and stnd deviation to find the final +/- error value?
  4. Jan 29, 2008 #3


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    Homework Helper

    The error in your avarage value is given by the standard deviation of the set of measurements divided by the square root of 10 - 1, thus divided by three. Your reaction time is incorporated automatically in the spread of the measurements.
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