Which of the Following Best Describes the Mean Absolute Deviation

Multiple Choice

Which of the following best describes the mean absolute deviation (MAD) :

A) it is the average of the squared differences between each data value and the mean
B) it is the negative square root of the variance
C) it measures the average absolute difference of data points from the mean
D) it is divided by n - 1 if the data is from a population
E) none of the above