Variance is
A)a measure of the average,or central value of a random variable
B)a measure of the dispersion of a random variable
C)the square root of the standard deviation
D)the sum of the deviation of data elements from the mean

Question

Quizplus · Accepted Answer

Variance is a measure of the spread or dispersion of a set of data. It is calculated as the average of the squared differences from the mean. It is not the same as the average or central value of a random variable (choice A), nor is it the square root of the standard deviation (choice C) but rather the standard deviation is the square root of the variance. Lastly, the sum of the deviation of data elements from the mean (choice D) is a measure of variability, but it is not the same as the variance.

Variance Is