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.
Analysis of Variance, or ANOVA for short, is a statistical test that looks for significant differences between means. For example, say you are interested in studying the education level of athletes in a community, so you survey people on various teams.