Is there convincing evidence that the true mean number of miles obtained by SuperWear tires is greater than that of the regular tires? , if a random sample of 16 regular tires is selected and a random sample of 25 SuperWear tires is selected, it is very that the sample mean number of miles of SuperWear is greater than the sample mean number of miles obtained by the regular tires. This gives reason to believe that true mean number of miles obtained by SuperWear tires is that of the regular tires.