Kwan recorded two sets of data. Set 1: 9, 13, 6, 18, 15, 19, 20 Median: 15 Lower Quartile: 9 Upper Quartile: 19 Range: 14 IQR: 10 Set 2: 9, 13, 6, 18, 15, 19, 20, 63 Median: 16.5 Lower Quartile: 11 Upper Quartile: 19.5 Range: 57 IQR: 8.5 One set of data shows an outlier. Which measure of spread was most impacted by the outlier?