University of Illinois
University of Illinois: Mste: Is There a Standard for All This Deviation?
Site contains information on the statistical term standard deviation. It gives a definition and shows how to calculate it. It has a link to information on the absolute value of a deviation and how the topics are related.
University of Illinois
University of Illinois: Spreading It Thick
Resource contains the definition for variance. It also shows students how to calculate the variance. There is a link to a bar graph that displays variance for the data example.
University of Illinois
University of Illinois: A "Vary" Nice Picture
Site from the University of Illinois contains a graphical representation of variance. A follow-up question for the user and a link to standard deviation - a related statistical topic - are also provided.