Measures of spread: range, variance & standard deviation
12:34
Khan AcademySal Khan
Measures of spread: range, variance & standard deviation
Range, variance, and standard deviation all measure the spread or variability of a data set in different ways. The range is easy to calculate—it's the difference between the largest and smallest data points in a set. Standard deviation is the square root of the variance. Standard deviation is a measure of how spread out the data is from its mean.
Feb 20, 2011
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