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Understanding the Basics of Standard Deviation

STANDARD DEVIATION

Standard deviation is the square root of variance and is the most commonly used measure of dispersion. The standard deviation represents the average amount by which the values in the distribution deviate from the mean. When sufficient large amount of data is used, the patterns of deviations from the mean will be spread symmetrically on either side and if the class interval are small enough the resultant frequency distribution curve may look like a bell shaped curve. A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data are spread out over a large range of values.

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