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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.
Every normal distribution is a version of the standard normal distribution, ... This fact is known as the 68–95–99.7 (empirical) rule, or the 3-sigma rule.
The G6AU and G6CU (both also called the 3.5 D ) are the large 3,497 cc (3.5 L; 213.4 cu in) versions of the Sigma engine. Bore and stroke are both larger at 93 mm × 85.8 mm (3.66 in × 3.38 in), respectively.
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The Cope rearrangement is an extensively studied organic reaction involving the [3,3] sigmatropic rearrangement of 1,5-dienes. [14] [15] [16] It was developed by Arthur C. Cope. For example, 3,4-dimethyl-1,5-hexadiene heated to 300 °C yields 2,6-octadiene. The Cope rearrangement of 3,4-dimethyl-1,5-hexadiene
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A five-sigma level translates to one chance in 3.5 million that a random fluctuation would yield the result. This level of certainty was required in order to assert that a particle consistent with the Higgs boson had been discovered in two independent experiments at CERN , [ 11 ] also leading to the declaration of the first observation of ...
The country’s overall debt load reached a new peak of $17.9 trillion, thanks to across-the-board growth in mortgage, auto, credit card, education, and other consumer debt, according to Federal ...