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  2. 68–95–99.7 rule - Wikipedia

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

    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.

  3. Shewhart individuals control chart - Wikipedia

    en.wikipedia.org/wiki/Shewhart_individuals...

    These limits reflect what the process will deliver without fundamental changes. [3]: 43 Points outside of these control limits are signals indicating that the process is not operating as consistently as possible; that some assignable cause has resulted in a change in the process. Similarly, runs of points on one side of the average line should ...

  4. Western Electric rules - Wikipedia

    en.wikipedia.org/wiki/Western_Electric_rules

    The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.

  5. Westgard rules - Wikipedia

    en.wikipedia.org/wiki/Westgard_Rules

    They are a set of modified Western Electric rules, developed by James Westgard and provided in his books and seminars on quality control. [1] They are plotted on Levey–Jennings charts , wherein the X-axis shows each individual sample, and the Y-axis shows how much each one differs from the mean in terms of standard deviation (SD).

  6. Control chart - Wikipedia

    en.wikipedia.org/wiki/Control_chart

    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 ...

  7. DeBrusk stars as the Canucks hold off the Senators for a 4-3 win

    www.aol.com/debrusk-stars-canucks-hold-off...

    OTTAWA, Ontario (AP) — Jake DeBrusk had two goals and an assist, and the Vancouver Canucks beat the Ottawa Senators 4-3 on Saturday night. Kiefer Sherwood had a goal and an assist for Vancouver ...

  8. Understanding the Rare Phenomenon of Prostitution in Adélie ...

    www.aol.com/understanding-rare-phenomenon...

    Watch the Video. Click here to watch on YouTube. Many animals engage in elaborate mating rituals. For flight-ready birds, these often involve complex dance moves and peacock-like displays of grandeur.

  9. Nelson rules - Wikipedia

    en.wikipedia.org/wiki/Nelson_rules

    Nelson rules are a method in process control of determining whether some measured variable is out of control (unpredictable versus consistent). Rules for detecting "out-of-control" or non-random conditions were first postulated by Walter A. Shewhart [1] in the 1920s.