To better describe the variation, we will introduce two other measures of variation—variance and standard deviation (the variance is the square of the standard deviation). These measures tell us how much the actual values differ from the mean. The larger the standard deviation, the more spread out the values.

Is variance always standard deviation squared?

The variance is the average of the squared differences from the mean. ... Standard deviation is the square root of the variance so that the standard deviation would be about 3.03. Because of this squaring, the variance is no longer in the same unit of measurement as the original data.

Is standard deviation deviation squared?

The standard deviation is the square root of the average squared deviation from the mean. The average squared deviation from the mean is also known as the variance. Computers are used extensively for calculating the standard deviation and other statistics.