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Graph analysis - how closely histogram fits poisson curve

  1. Feb 17, 2010 #1
    1. The problem statement, all variables and given/known data

    Its about random radioactive decay. I have a histogram showing the number of counts recorded in 3 second intervals and I've drawn the Poisson Curve on the same graph.

    I have a graph for 50 intervals and one for 100 intervals and I need to analyse how well the data agrees with Poisson Distribution....and see if the 100 interval graph is any better than the 50 intervals.

    2. Relevant equations


    3. The attempt at a solution

    I was thinking I should add up the differences between each bar on the histogram and the curve...subtracting the ones under the curve and adding the ones above. I'm sure this has a name in statistics and I need to know what it is - that's basically my question.

    What is the name of this graph analysis/statistics thing that I'm using? Or should I be doing something else???

    I posted this in Physics first but I think it might be better in here...I just wanna know what to look up in order to find out how to analyse my graphs!..
  2. jcsd
  3. Feb 19, 2010 #2
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