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Statistical Uncertainty for Discrete Events

  1. May 26, 2009 #1
    I am not sure how to answer the following question, which I have posed to myself to better understand the method:

    "Suppose two six-sided dice are rolled together N times. What is the uncertainty in the number of times any given total appears on the dice?"

    For example, what is the uncertainty in the number of times 8 is rolled if N is 100? (You can call the number of times 8 appears another variable such as m).

    I can see how you would analyze this system by finding the mean and variance of the distribution, but what if I just want to know the uncertainty in only one channel of the distribution?
     
  2. jcsd
  3. May 27, 2009 #2
    Well, the first step is to find the distribution for that specific total. For that you can use the binomial distribution, where in your example p = the probability that 8 comes up on a single roll. You then just need to use the entropy of the binomial distribution.
     
  4. May 28, 2009 #3
    Thank you! The binomial test was just what I was looking for.
     
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