Degree of dispersion of data about the mean. The square root of the variance is the standard deviation. For bell‐shaped curves, the larger the variance, the flatter the distribution curve; the smaller the variance, the more peaked the curve.
A measure of variation equal to the square of the standard deviation or its estimate.
A measure of variability of a frequency distribution is computed by finding the difference between each score and the mean, squaring the result, adding all the squared deviations obtained in this manner, and dividing it by the number of cases.
A statistical index of the degree to which measurements in a data set are different from each other or deviate from the mean; the square of the standard deviation.