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Homework Help: Proof of equation

  1. Apr 25, 2014 #1
    Hi there. I need some help to prove one equation.
    There is my solution but something is wrong i think.
    Any help would be appreciated :)
  2. jcsd
  3. Apr 25, 2014 #2


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    You should be able to simplify each side to$$
    \sum_{i=1}^n (X_iY_i) - n\bar X \bar Y$$
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