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What is the main difference between the variance and the standard deviation as measures of variability?...

What is the main difference between the variance and the standard deviation as measures of variability?

standard deviation is variability around the median, whereas variance is variability around the mean

standard deviation is squared variability around the mean, whereas variance is in the original units

variance is for the population, whereas standard deviation is around the sample mean.

variance is squared variability around the mean, whereas standard deviation is in the original units
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