4. Cafazzo et al. studied a group of stray dogs in Rome, and ranked them from 1 (most dominant) to 27 (least dominant.) They split the results by gender . Ranks of males: 1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 17, 18, 19, 20, 21 . Ranks of females: 7, 8, 9, 10, 15, 16, 22, 23, 24, 25, 26, 27 Is there any diference between males and Is there any difference between males and females? Find the two-tailed P-value for: (a) The Wilcoxon rank-sum test. (b) A van der Waerden test Solution.