The Standard Deviation

Approximate time to complete: 20 Minutes

Why you need a measure of variability. Why the standard deviation is a good measure of the average distance to the mean. How to calculate the standard deviation and variance. How to interpret and use the standard deviation. Every-day examples of the standard deviation.

This tutorial contains the following lessons:

Introduction to the Standard Deviation
Why do you need a measure of Variability?
Measuring the Average Distance to the Mean
Variability Quiz
Population versus Sample Standard Deviation
Standard Deviation Calculation
Standard Deviation Calculation Short-Cut Method
The Standard Deviation with Excel and The Online Calculator
Standard Deviation in Practice
Standard Deviation Quiz