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 analysis is the quantitative investigation of the difference between actual and planned behavior. This analysis is used to maintain control over a business. For example, if you budget for sales to be $10,000 and actual sales are $8,000, variance analysis yields a difference of $2,000.