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.
An R Introduction to Statistics. Variance. The variance is a numerical measure of how the data values is dispersed around the mean. In particular, the sample variance is defined as: Similarly, the population variance is defined in terms of the population mean Î¼ and population size N: Find the variance of the eruption duration in the data set faithful.