+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 16 to 22 of 22

Thread: please i need help in solving these questions

  1. #16
    Points: 529, Level: 10
    Level completed: 58%, Points required for next Level: 21

    Posts
    11
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: please i need help in solving these questions




    no i know the binomial distribution.. and i tried to solve it and got this answer 90.15% but its wrong !!!

  2. #17
    TS Contributor
    Points: 22,410, Level: 93
    Level completed: 6%, Points required for next Level: 940

    Posts
    3,020
    Thanks
    12
    Thanked 565 Times in 537 Posts

    Re: please i need help in solving these questions

    The number looks close.

    BTW why do you know it is wrong? You have the suggested solution?

  3. #18
    Points: 529, Level: 10
    Level completed: 58%, Points required for next Level: 21

    Posts
    11
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: please i need help in solving these questions

    the right is 92.07 ??????

  4. #19
    Points: 529, Level: 10
    Level completed: 58%, Points required for next Level: 21

    Posts
    11
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: please i need help in solving these questions

    right answer **

  5. #20
    TS Contributor
    Points: 22,410, Level: 93
    Level completed: 6%, Points required for next Level: 940

    Posts
    3,020
    Thanks
    12
    Thanked 565 Times in 537 Posts

    Re: please i need help in solving these questions

    Yes I have verified that answer 92.07% in R once by normal approximation. Do you know how to do?

  6. #21
    Points: 529, Level: 10
    Level completed: 58%, Points required for next Level: 21

    Posts
    11
    Thanks
    1
    Thanked 0 Times in 0 Posts

    Re: please i need help in solving these questions

    opps how did u find this,
    i feel that some information missed here

  7. #22
    TS Contributor
    Points: 22,410, Level: 93
    Level completed: 6%, Points required for next Level: 940

    Posts
    3,020
    Thanks
    12
    Thanked 565 Times in 537 Posts

    Re: please i need help in solving these questions


    A Binomial(n, p) random variable is distributionally equal to the sum of n independent and identically distributed Bernoulli(p) random variables.

    By Central Limit Theorem, if such independent sum minus its mean, and then divided by its standard deviation, then this standardized sum will converge to a standard normal distribution.

    Usually the factorials in Binomial pmf is difficult to evaluate when n is large. So this approximation is useful, especially when the computer power is not so great in the past.

  8. The Following User Says Thank You to BGM For This Useful Post:

    help101 (12-11-2011)

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

           




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats