Sigmund is applying statistics to find the spread of the middle half of his data set using the median. What is he MOST likely determining?
A. the interquartile range because it measures the mean of the data
B. the interquartile range because it measures the maxima of the data
C. the interquartile range because it measures the minima of the data
D. the interquartile range because it measures the middle 50 percent of the data