Which of the following are true about the MAD statistic? There may be more than one statement that is true.
a. The MAD statistic can never be negative.
b. The MAD statistic is the average distance sample proportions are from each other.
c. The MAD statistic is the average of a group of sample proportions.

d. A MAD statistic of zero means that all the proportions are the same distance apart.
e. As the MAD statistic increases, the p-value decreases.