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Math Help - question about standard deviation

  1. #1
    Member
    Joined
    Sep 2005
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    84

    question about standard deviation

    hello. recently i am doing a maths coursework. i am sampling a list of students, which i have randomly selected.

    i recently done standard deviation. when i do standard deviation by hand using the forumula i end up with a different results compared to the one i end up with when using excel (its normally 1 number higher on excel). why is this?

    please can someone tell why this is?
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  2. #2
    Junior Member
    Joined
    Oct 2005
    Posts
    27

    standard dev

    Standard dev has one formula that uses n in the denom and another that uses n-1
    Excel is using a formula with a different denom.
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