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Homework Help: Stats regression problem, need hlep QUICK

  1. Feb 7, 2005 #1
    If the regression equation is y=2.3-1(x) and r^2 = 0.78, what is the value of the coefficient of correlation?

    my answer was 0.88 and i got it wrong, is it -0.88 because of the negative slope in the equation??? plz help fast.. thnx
  2. jcsd
  3. Feb 8, 2005 #2
    remember that a square root can have [tex] \pm a [/tex] as a root. Since the correlation is negative we must have a negative r.
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