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Statistics IntroductionDescriptive StatisticsInferential StatisticsMean, Median, Mode and RangeVariance, Standard Deviation and Relative VariabilityLinear TransformationsFrequency Table
Sample and Population Standard Deviation CalculatorRelative Standard Deviation CalculatorStandard Error CalculatorMean Deviation CalculatorSample and Population Standard Deviation CalculatorRelative Standard Deviation CalculatorLand Area CalculatorFind Time from Distance and SpeedFind Distance from Speed and TimeFind Speed from Distance and TimeDays Sales Outstanding CalculatorRelative Risk CalculatorRelative Standard Deviation CalculatorRelative Error Calculator
Sample and Population Standard Deviation CalculatorRelative Standard Deviation CalculatorStandard Error CalculatorMean Deviation CalculatorSample and Population Standard Deviation CalculatorRelative Standard Deviation CalculatorLand Area CalculatorFind Time from Distance and SpeedFind Distance from Speed and TimeFind Speed from Distance and TimeDays Sales Outstanding CalculatorRelative Risk CalculatorRelative Standard Deviation CalculatorRelative Error Calculator
Variance, Standard Deviation and Relative Variability
Variance
Variance can be explained as the process of measuring how the items would disperse about their mean. For the variance (σ2) of overall population can be given by the equation:
Variance (s2) would be calculated in a different way:
Standard Deviation
The square root of variance is known as standard deviation. (Hence, for population we can say the standard deviation is nothing but the square root of square deviation's average from mean.)
Both Standard deviation and variance are very closely related as both are useful for finding the variability. i.e, square root of variance is known as standard deviation and the average of the square difference is known as the variance.
Relative Variability
The standard deviation divided by its mean of a set is known as relative variability. Relative variability comes handy while we compare numerous variances.
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