Other
Northern Michigan University: Line Plots
The author utilizes a line plot to demonstrate what an "outlier" is, what "clusters" are, and what "gaps" are.
Soft Schools
Soft Schools: Outliers
On this websites students explore the concept of outliers. Students are given several data sets and investigate how outliers can effect the mean and median of a data set.
McGill University
Removing Outliers
This site discusses the topic of removing outliers and how the configurations are done.
Education Place
Houghton Mifflin: Eduplace: Math Steps: What Is It? Data
This is a great place for lesson information on the concept of analyzing data - measures of central tendency. Three other tabs are available besides the "What Is It?" link. Tips and Tricks, When Students Ask, and Lesson Ideas also...