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  2. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.

  3. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    About 68% of values drawn from a normal distribution are within one standard deviation σ from the mean; about 95% of the values lie within two standard deviations; and about 99.7% are within three standard deviations. [6] This fact is known as the 68–95–99.7 (empirical) rule, or the 3-sigma rule.

  4. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    This defines a point P = (x 1, x 2, x 3) in R 3. Consider the line L = {(r, r, r) : r ∈ R}. This is the "main diagonal" going through the origin. If our three given values were all equal, then the standard deviation would be zero and P would lie on L. So it is not unreasonable to assume that the standard deviation is related to the distance ...

  5. Outlier - Wikipedia

    en.wikipedia.org/wiki/Outlier

    Relative probabilities in a normal distribution. In the case of normally distributed data, the three sigma rule means that roughly 1 in 22 observations will differ by twice the standard deviation or more from the mean, and 1 in 370 will deviate by three times the standard deviation. [6]

  6. Three-sigma rule - Wikipedia

    en.wikipedia.org/?title=Three-sigma_rule&redirect=no

    This page was last edited on 24 September 2024, at 05:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  7. The 3-3-3 Rule Can Be a Mental Health Game Changer - AOL

    www.aol.com/3-3-3-rule-mental-130000886.html

    The 3-3-3 Rule Can Be a Mental Health Game Changer. Alyssa Jung. August 31, 2024 at 9:00 AM "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links."

  8. Mathematical psychology - Wikipedia

    en.wikipedia.org/wiki/Mathematical_psychology

    Mathematical psychology is an approach to psychological research that is based on mathematical modeling of perceptual, thought, cognitive and motor processes, and on the establishment of law-like rules that relate quantifiable stimulus characteristics with quantifiable behavior (in practice often constituted by task performance).

  9. What do teens mean when they say ‘sigma’? - AOL

    www.aol.com/news/teens-mean-sigma-000158935.html

    "Sigma” is a slang word for “the best” or someone who is a humble alpha male. ... Another definition for “sigma” says Lindsay, is “the best.” ... math problems (to solve) with an ...