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You can search this electronic textbook for statistics topics including ANOVA, linear regression models, the effects of outliers, confidence intervals, etc. Gives explanations and discusses the topics.

Goes over collecting and organizing data into frequency tables, histograms, box and whisker plots, and stem-and-leaf plots. Also shows finding mean, median and mode. Many include videos!

Definition of outliers, and the quartiles. With example and their connections to histograms, scatterplots, least square fitting

Interactive applet that allows a student to plot points on a graph and see how an outlier affects the regression line of the data points.