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Math Help - Need help with Calculation of Correlation Coefficient (and particularly covariance)

  1. #1
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    Need help with Calculation of Correlation Coefficient (and particularly covariance)

    Hi guys

    In my preparation for a statistics exam (here in Norway), I struggle with calculating the correlation coefficient. It seems like this is supposed to be an easy task, but nevertheless I am not able to calculate the right figures. Here are my example values:

    X: 42 39 43 43 38 41 40 42 43 44
    Y: 118 68 112 88 140 79 105 113 92 103

    And the formula is; Covariance / (\sigma X * \sigma Y) ,

    Here are my, probable not correct, calculations:
    Xaverage: 41,5
    Yaverage: 101,8
    \sigma X = 9,67
    \sigma Y = 28,01
    Covariance = donīt really understand how to calculate it

    This is quite a unorganized post, but hope some of you still would care to explain how to calculate the main values needed. Preferrably, examplified by the X- and Y-values in the example.

    Pardon me for my English and the structure of this post.
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  2. #2
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    Follow this example

    Covariance
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