Variability is one of the more challenging concepts in your course. Let's get a feel for it before we jump into the math.

# Chapter 4: Variability

**121** students taking these chapter lessons

## Modules

## Variability Explained Without Math

## Variance and Standard Deviation

The range fails miserably as a proper measure of variability. These videos will show you why that is, and how a new (more complicated) approach give us much better method.

### Lessons

## All the Essential Formulas

Computational formulas, definitional formulas, population formulas, sample formulas... they're all here!

### Lessons

## Understanding the Standard Deviation

The standard deviation is not a very intuitive measure. Here are a few videos to help you better grasp the concept.