Results 1 to 2 of 2

Thread: Probability

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    51

    Probability

    Positive test result-
    Did not lie_______Lie
    ----------------------
    15_____________42
    (false pos.)____(true pos.)


    Negative tes result-
    Did not lie________Lie
    ----------------------
    32______________9
    (true neg.)_____ (false neg.)


    If four of the test subjects are randomly selected without replacement, find the probability that, in each case, the polygraph indicated that the subject lied.

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Jan 2009
    Posts
    105
    Quote Originally Posted by hydride View Post
    Positive test result-


    Did not lie_______Lie
    ----------------------
    15_____________42
    (false pos.)____(true pos.)


    Negative tes result-
    Did not lie________Lie
    ----------------------
    32______________9
    (true neg.)_____ (false neg.)


    If four of the test subjects are randomly selected without replacement, find the probability that, in each case, the polygraph indicated that the subject lied.

    Thanks!
    There are 98 subjects and the polygraph has said that 15 + 42 = 57 of them lied (positive result). So the required probability will be (57/98)(56/97)(...)(...) = ...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 10
    Last Post: Jan 21st 2011, 12:47 PM
  2. Replies: 3
    Last Post: May 29th 2010, 08:29 AM
  3. Replies: 1
    Last Post: Feb 18th 2010, 02:54 AM
  4. Replies: 0
    Last Post: Jan 20th 2010, 07:04 AM
  5. Replies: 3
    Last Post: Dec 15th 2009, 07:30 AM

Search tags for this page

Search Tags


/mathhelpforum @mathhelpforum