a large corporation sends many of its first-level managers to an off-site supervisory skills training course. four different management development centers offer this course. the director of human resources would like to know whether there is a difference among the quality of training provided at the four centers. an independent random sample of five employees was chosen from each training center. the employees were then ranked 1 to 20 in terms of supervisory skills. a rank of 1 was assigned to the employee with the best supervisory skills. suppose the ranks are as shown. course abcd 241816 147175 101613 123208 1511199
