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2 sigma?
Message posted by Bob on May 25, 2000 at 12:00 AM (ET)
Anyone willing and capable of a quick and dirty explanation of 2 sigma and how it
relates to standard deviation?
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Re: 2 sigma?
Message posted by Phil on May 26, 2000 at 12:00 AM (ET)
"sigma" refers to one standard deviation. Two sigma would mean two standard deviations. In a "normally distributed" population 95.5% of the population would be within +/- 2 standard deviations from the mean. This is a very commonly used interval in statistics.
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