It is sometimes more useful as, taking square root removes the units from the analysis.Standard deviation is the square root of variance.□ Why Standard Deviation often used more than Variance? Divide this sum of squares by n – 1 (for a sample) or N (for population).Find each data point's difference from mean value.When calculating a sample variance to estimate a population variance, denominator of variance equation becomes ( n− 1) so that estimation is unbiased and does not underestimate population variance □ Calculating Variance: □ Why Sample Variance formula have (n - 1) in it? We don't always have data of population available, so we always consider Sample data over Population data □ Why Population Variance can't be used all the time? □ When to use Population Variance and Sample Variance?
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