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Uses of Standard Deviation
a.tandard deviation is used widely in statistics unless there is some definite reason for not using it.
b.It is used when one needs a measure of greater stability.
c.Standard deviation plays a great role in sampling theory correlation and regression theory etc.
d.Standard deviation is regarded as best and most powerful measure of dispersion as mean of central tendency.
Method of Concurrent Deviations The coefficient of concurrent deviation or coefficient of correlation b the concurrent deviation methods is given by the formula. R
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