What are the similarities and differences between these data sets in terms of their centers and their variability? data set a: 14, 21, 24, 28, 28, 35 data set b: 18, 19, 21, 25, 29, 32 select from the drop-down menus to correctly complete the statements. comparing the centers of the data sets, the median for data set a is (less than, greater than, equal to) the median for data set b. the mean for data set a is (less than, greater than, equal to) the mean for data set b.