Plop It! lets you experiment with the concepts of mean, median, and mode (measures of center). You see the differences among them on a bar graph, as you add or remove blocks to an axis with a given range.

Students describe graphs and explore range, measures of central tendency, and distribution in this interactive web lesson.

Understanding how to interpret data by its shape, spread, and center helps students to understand statistics.

This lesson plan introduces quartiles and box plots. It contains an activity and discussion. Supplemental activities about how students can represent data graphically are also included.

Enter data and view the mean, median, variance, and standard deviation of the data set.

Calculate basic summary statistics for a sample or population data set including minimum, maximum, range, sum, count, mean, median, mode, standard deviation and variance.

This site looks at measures of central tendency and dispersion. Discussed are topics such as standard deviation, mean, median, and mode.

Illustrated accounts of the destruction and loss of two ships sailing to America across the Atlantic illuminate the dangers of nineteenth-century travel and the modes of rescue available at the time. With a range of archival material,...