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Tool: Measures of Spread
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Go to: http://www.svgs.k12.va.us/.../Spread.htm (opens a new window)
Description: Students can load, modify, and plot histograms for six datasets, as well as compute the mean, median, interquartile range, and standard deviation. They can observe the effects of altering the dataset, such as by deleting outliers, on those statistical measures. Includes interactive quiz.
Technology Type: Flash 
Author: Ralph Irons (Surfin' Sinefeld)
Language: English 
Cost: Does not require payment for use

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Courses: Math 7 Variance & range
Probability & Statistics Displaying with Graphs, Describing with Numbers