10.46 The true average diameter of ball bearings of a certain type is supposed to be 0.5 inch. What conclusion is appropriate when testing H0: m 5 0.5 versus Ha: m ? 0.5 inch each of the following situations:

a. n 5 13, t 5 1.6, a 5 .05

b. n 5 13, t 5 21.6, a 5 .05

c. n 5 25, t 5 22.6, a 5 .01

d. n 5 25, t 5 23.6