(Choose 1 answer)
(See picture)
A. None of the other choices is correct
B. is normal with mean m and variance 1347.22.
C. is normal with mean 0 and standard deviation 1347.22
D. is normal with mean 12 and variance 1347.22.
E. is standard normal.
To determine the difference, if any, between two brands of radial tires, 12 tires of each brand are tested. Assume that the lifetimes of both brands of tires come from the same normal distribution N(m, 33002). The distribution of the difference of the sample mean X - Ý...
