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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.
Sigma (/ ˈsɪɡmə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation.
Six Sigma (6σ) is a set of techniques and tools for process improvement. It was introduced by American engineer Bill Smith while working at Motorola in 1986. [1][2] Six Sigma strategies seek to improve manufacturing quality by identifying and removing the causes of defects and minimizing variability in manufacturing and business processes.
Sigma Sigma Sigma (ΣΣΣ), also known as Tri Sigma, is a national American women's sorority. Sigma Sigma Sigma is a member of the National Panhellenic Conference (NPC), an umbrella organization encompassing 26 national sororities or women's fraternities, which focus on service, education, scholarship programming and social activities.
Phi Sigma Sigma (ΦΣΣ), colloquially known as Phi Sig, was the first collegiate nonsectarian sorority to allow membership of women of all faiths and backgrounds. [1]The sorority was founded on November 26, 1913, and lists 60,000 initiated members, 115 collegiate chapters, and more than 100 alumnae chapters, clubs, and associations in the United States and Canada.
Sigma Brother Charles R. Taylor (On Arizona Cleaver & the organization of Zeta Phi Beta) The newly established Zeta Phi Beta sorority, Inc. was given a formal introduction at the Whitelaw Hotel by their Sigma counterparts, Charles R. and A. Langston Taylor. As National Executive Secretary of Phi Beta Sigma, Charles Taylor wrote to all Sigma chapters requesting they establish Zeta chapters at ...
In addition, he wrote Sigma's first constitution and was the first president of Alpha Chapter. He was the first person to graduate from Howard University in 3 years with two degrees (A.B and a B.Ed. degree). Charles I. Brown (August 27, 1890 – December 21, 1981), co-founder of Phi Beta Sigma Fraternity; first vice-president of Phi Beta Sigma.
Sigma Beta Rho Sigma Psi Zeta In 2017, the member organizations unanimously voted to add Desi to its formal name, a word describing people from the Indian subcontinent or South Asia, and in doing so adopted the acronym APIDA, to explicitly reflect their service of groups with South Asian membership.