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Statisitcs HELP! Again... I know...
#2
You divide by N for a population standard deviation, and by N-1 for a sample standard deviation. Take a look here for further explanation. I don't remember this being a cause of confusion when I took the ECE -- seems like knowing that the SD was the square root of the variance was enough for most questions, but don't trust my memory. Big Grin

-Gary-
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Statisitcs HELP! Again... I know... - by bzptc0 - 05-30-2008, 03:56 PM
Statisitcs HELP! Again... I know... - by gcalvin - 05-30-2008, 04:18 PM

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