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In the empirical sciences, the so-called three-sigma rule of thumb (or 3 σ rule) expresses a conventional heuristic that nearly all values are taken to lie within three standard deviations of the mean, and thus it is empirically useful to treat 99.7% probability as near certainty.
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Brian Govern, review author Antonia Neshev, creator of the Three Wolf Moon design. The Three Wolf Moon T-shirt, created by The Mountain Corporation, gained popularity after attracting sarcastic reviews on Amazon.com attributing great power to it, such as making the wearer irresistible to women, striking fear into other males, and having magical healing abilities.
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Even when a process is in control (that is, no special causes are present in the system), there is approximately a 0.27% probability of a point exceeding 3-sigma control limits. So, even an in control process plotted on a properly constructed control chart will eventually signal the possible presence of a special cause, even though one may not ...
Police officers, firefighters, nurses, postal workers, public school teachers and government employees are among the nearly 3 million public sector workers affected by the provisions.
Most analytical instruments produce a signal even when a blank (matrix without analyte) is analyzed.This signal is referred to as the noise level. The instrument detection limit (IDL) is the analyte concentration that is required to produce a signal greater than three times the standard deviation of the noise level.
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