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In the textbook it says this:

http://img6.imageshack.us/img6/1896/imgcxv.jpg [Broken]

Where does this hocus pokus 'it turns out that dividing by n-2 rather than n appropriately compensates for this' come from?

http://img6.imageshack.us/img6/1896/imgcxv.jpg [Broken]

Where does this hocus pokus 'it turns out that dividing by n-2 rather than n appropriately compensates for this' come from?

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