Being able to apply statistics is like having a secret superpower. Where most people see averages, you see confidence intervals. When someone says “7 is greater than 5,” you declare that the data-generating processes are, in fact, indistinguishable. In a cacophony of noise, you hear a cry for hel…

The article contains a solid collection of statistical formulae.

Link: Statistical Formulas For Programmers via www.evanmiller.org