Anxiety can often make these related conditions worse, so talk with a mental health care professional if anxiety begins to interfere on a daily basis.
In probability theory and statistics, the variance of a random variable is a measure of its statistical dispersion, indicating how far from the expected value its values typically are. The variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant.
Variance is the square of the standard deviation. For us humans, standard deviations are easier to understand than variances because theyâre in the same units as the data rather than squared units. However, many analyses actually use variances in the calculations. F-statistics are based on the ratio of mean squares.