Sample Size Calculator

A statistical tool that returns the number of samples required in order to achieve a certain level of confidence and precision (a.k.a. margin of error) for a population with a given portion of defects or standard deviation. It can be calculated on both continuous or discrete values. The version provided by StatStuff is unique because it can return either the level of confidence or precision for you if you already have a given sample size.
Related StatStuff Video: 
   -Section 5-Measure Phase, Lesson #19 - Calculating a Sample Size