Which one of the given measures of dispersion is considered best? (A) Standard deviation (B) Range (C) Mean deviation (D) Coefficient of variation

Standard deviation

The square root of the variance is known as the standard deviation i.e. S.D. = √σ. Standard Deviation, the most widely used measure of dispersion, is based on all values. Therefore a change in even one value affects the value of standard deviation. It is independent of origin but not of scale. It is also useful in certain advanced statistical problems

Therefore, the correct answer is (A)

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