similarity between q 12.19 and exam type question

Discussion in 'CT3' started by dextar, Sep 12, 2013.

  1. dextar

    dextar Member

    Hi
    I have one observation regarding q12.19 and the exam type question given at the back (first question part c)
    For instance in Q12.19 to find MLE
    L(theta)=prod 6Cxi theta ^xi (1-theta)^(6-xi)
    This can also be written as which I think is simpler to write but tedious to solve (as mentioned in the exam type question part c)
    P(N=0)^38.P(N=1)^70....
    Both of the expressions are giving the same MLE

    My question is
    in the solution to Q12.19 what is the the sigma (xi) represent. They have taken it as 301 which is
    0*38+1*70+...

    I'm not able to understand what sigma xi represents. does it represent the expected no of bottles containing impurities?.
    Will not P(N=0)^38.P(N=1)^70.... method fits in everytime?
     
  2. John Lee

    John Lee ActEd Tutor Staff Member

    The X is the number of successes, so the sum is the total number of successes.

    Yes
     

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