Anxiety disorders can be seen with other mental health conditions, such as: 1  Depression. 2  Substance abuse. 3  ADHD. 4  Eating disorders. 5  Trouble sleeping.
A variance has several meanings in business. In an accounting sense, a variance is the difference between an actual amount and a pre-determined standard amount or the amount budgeted. In a statistical sense, a variance is a measure of the amount of spread in a distribution.
Variance is a statistical measure that tells us how measured data vary from the average value of the set of data. In other words, variance is the mean of the squares of the deviations from the arithmetic mean of a data set. 1  Variance is the square of the standard deviation.  The formula for variance is.