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S3 Edexcel Query Watch

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    Hey,

    So in the Edexcel S3 book, chapter 3 examples 8 and 10, they're using this formula to calculate the estimated variance: (uploaded)

    Why is the denominator (n-1) instead of n as usual? Am I missing something completely obvious?

    Any help will be much appreciated thanks!
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    (Original post by Nikhilm)
    Hey,

    So in the Edexcel S3 book, chapter 3 examples 8 and 10, they're using this formula to calculate the estimated variance: (uploaded)

    Why is the denominator (n-1) instead of n as usual? Am I missing something completely obvious?

    Any help will be much appreciated thanks!
    http://www.thestudentroom.co.uk/forumdisplay.php?f=38
 
 
 
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