Variance

In statistics, variance is the measure of the expected deviation from the mean. The square root of the variance is the standard deviation.

Variance is a college-level concept that would be first encountered in a probability and statistics course. It is an Advanced Placement Statistics topic and is listed in the California State Standards for Probability and Statistics.

Prerequisites

Standard Deviation:

The standard deviation is a statistic defined as the square root of the variance that measures how spread out a set of data is.

Classroom Articles on Probability and Statistics (Up to College Level)

	Arithmetic Mean	Median
	Binomial Distribution	Mode
	Box-and-Whisker Plot	Moment
	Central Limit Theorem	Normal Distribution
	Chi-Squared Test	Outlier
	Conditional Probability	Paired t-Test
	Confidence Interval	Poisson Distribution
	Correlation Coefficient	Probability
	Covariance	Problem
	Erf	Sample
	Histogram	Scatter Diagram
	Hypothesis	Statistical Test
	Independent Events	Statistics
	Law of Large Numbers	Uniform Distribution
	Least Squares Fitting	z-Score
	Mean