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.
population variance is the average of the squared distances of the data values from. the mean. The sample variance is the âaverageâ (divide by n-1 instead n) of the squared distances. of the data values from the mean (âresidualsâ).