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Math Planet
Math Planet: Stem and Leaf Plots and Box and Whiskers Plot
Discover how to use stem-and-leaf plots and box-and-whisker plots to visualize data by taking a look at examples and a video lesson.
National Council of Teachers of Mathematics
Nctm: Illuminations: Advanced Data Grapher
The Advanced Data Grapher can be used to analyze data with box plots, bubble graphs, scatterplots, histograms, and stem-and-leaf plots.