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One More Prob. Question

  1. Apr 24, 2006 #1
    Many skipped classes: GPA < 2 = 80 people, GPA between 2 and 3 = 25 people, GPA > 3 = 5 people

    Few skipped classes: GPA < 2 = 175 people, GPA between 2 and 3 = 450 people, GPA > 3 = 265

    Are "GPA between 2 and 3" and "skipped few classes" independent?
    A. No, b/c .475 does not equal .506
    B. No, b/c .475 does not equal .89
    C. No, b/c .450 does not equal .475
    D. Yes, because of conditional probabilities
    E. Yes, because of the product rule

    I know that they are independent if P(A n B) = P(A) * P(B)
    .45 = .475 * .89
    No it does not, .45 does not equal .42275
     
  2. jcsd
  3. May 1, 2006 #2

    Tom Mattson

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    Gold Member

    That's what I get too.
     
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