The following are NO, readings (ppm) obtained for two camshafts of different design tested in 8 different engines: Engine Camshaft A Camshaft B 1 37 34 2 11 12 3 67 59 4 7 6 5 29 25 6 22 19 7 22 24 8 57 45 Your supervisor brings you this data and says that one group of engineers claims there is essentially no difference between the camshafts, while another says that the design of camshaft B leads to reduced NO, emissions. Which group is right? Justify your