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Problem calculating binomial distribution.

  • 09-01-2010 8:30pm
    #1
    DeadMoney
    Registered Users, Registered Users 2 Posts: 1,127 ✭✭✭


    Hi, I am going through some tutorials for frequency distributions and am getting stuck on binomial distribution. I know how it works but just can't work through the formula properly.

    For example, in a sample question p= .3 and 1-p = .7 and n=5

    I can't really type out the formula here as it will look messy but following the binomial formula the answer for P(O) = .168 (according to the tutorial note)

    The bit I am getting stuck as is just working through the formula. Can anybody work out the P(O) here using these figures?
    Thanks


Comments

  • #2
    gerry87
    Registered Users, Registered Users 2 Posts: 872 ✭✭✭gerry87


    DeadMoney wrote: »
    Hi, I am going through some tutorials for frequency distributions and am getting stuck on binomial distribution. I know how it works but just can't work through the formula properly.

    For example, in a sample question p= .3 and 1-p = .7 and n=5

    I can't really type out the formula here as it will look messy but following the binomial formula the answer for P(O) = .168 (according to the tutorial note)

    The bit I am getting stuck as is just working through the formula. Can anybody work out the P(O) here using these figures?
    Thanks

    P(O) is probably P(0), which would fit in to the formula, its usually as "r" or "k", anyway:

    P(k) = (n choose k) * [(p)^(k)] * [(1-p)^(n-k)]

    so,

    P(0) = (5 choose 0) * [(.3)^0 ] * [(.7)^5]
    = 1*1*(.7^5)
    = 0.16807


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