Actually, I dont' think that's correct « Next Oldest | Next Newest »

 ▼ Gene Posting Freak Posts: 1,107 Threads: 159 Joined: Jan 1970 03-27-2003, 10:04 AM The formula for standard deviation of a sample has n-1 on the denominator, so it should work for 2 data points. Suppose the data are 10 and 5 Standard deviation is SQRT ((( 10 - 7.5 ) ^2 + (5 - 7.5) ^2) divided by (2 - 1)) Which works out to be 2.5 Granted, that's not exactly helpful with only 2 data points, but it does work. Population standard deviation only has n on the denominator, so you can compute it when you only have 1 data point...the value of the standard deviation in that instance would be 0.

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