Scott Nevil is an experienced writer and editor with a demonstrated history of publishing content for Investopedia. He goes in-depth to create informative and actionable content around monetary policy ...

Lean Six Sigma is an approach for efficiency in manufacturing and business that uses statistical modeling with the goal of delivering stable and predictable results. The original Six Sigma philosophy, ...

Some know “sigma” as the 18th letter of the Greek alphabet but it’s also teen slang for a cool dude. According to Know Your Meme, sigma is “referring to a supposed classification for men who are ...