This site discusses the standard deviation of grouped and ungrouped data, data transformation, and the standard deviation between and within subjects. Exercises are provided as well as the answers.
This site gives a definition and an example of numerical summaries. Topics include mean, median, quantiles, variance, and standard deviation.
The page calculates summary statistics for any dataset. Users will be prompted for sample size when opening this page. The calculator returns mean, sum of X, sum of X^2, variance, standard...
This source defines and explains variance and standard deviation.
This resource defines and explains standard deviation and the normal distribution.
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