Two different brands of racing bicycles are tested by five cyclists. The top speeds attained are given in the following list. Is there convincing evidence that one brand is superior?

cyclist 1 cyclist 2 cyclist 3 cyclist 4 cyclist 5 cyclist 6 Brand A 30.5 41.2 29.8 35.9 25.7 40.3 Brand B 30.3 46.3 36.1 40.1 35.2 40.0 POLI967