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 ¼ 13, t ¼ 1.6, a ¼ .05 b. n ¼ 13, t ¼ 1.6, a ¼ .05 c. n ¼ 25, t ¼ 2.6, a ¼ .01 d. n ¼ 25, t ¼ 3.9