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To: RoseCampion who wrote (1292)	1/18/2000 11:27:00 PM
From: Tom K.	Respond to of 8096

...So what's the formula to get the second standard deviation during a particular time period? It can't be just 2x the first one, can it?... Rose, as I understand the normal distribution, the probability of being within 1 standard deviation is 68%. The probability of being within 2 SD's is 96%. so, once you know the SD (which is the distance it should swing over the time period), you can then decide what degree of probability you want and compute the swing to plan for. 96% of the time it will stay within 2 SD's. I trust that is what you meant by a second standard deviation. Hope that helps. Tom