The true average diameter of ball bearings of a certain type is supposed to be .5 in. A one-sample
t-test will be carried out to see whether this is the case. What conclusion is appropriate in each of
the following situations?
a. n = 13, t = 1.6, α = 0.05
b. n = 13, t = -1.6, α = 0.05
c. n = 25, t = -2.6, α = 0.01
d. n = 25, t = -3.9