It could refer to four standard errors. If an observation from a Gaussian (normal) distribution is 4 standard errors away from the mean, it has an extremely low probability.
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The capital sigma. The capital sigma. The capital sigma. The capital sigma.
Well, darling, Sigma Sigma Sigma was created on April 20, 1898 at Longwood University in Farmville, Virginia. So, if you're ever on a game show and they ask you that question, you can thank me later for making you look like a smarty pants.
Sigma Mu Sigma was definitely at Lynchburg College between 1968-1972.
Methane has tetrahedral geometry. In methane carbon undergoes sp3 hybridisation. The four sp3 hybrid orbitals form four sigma bonds with four 1s orbitals of hydrogen atoms.
3 Sigma is 66800 defects per million pieces 6 Sigma is 3-4 defects per million pieces You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion chart in the related links section