Comparing one-tailed with two-tailed t-Test Question 34 options: a) one-tailed t-Test increases the probability of Type-I error b) there is a greater probability of rejecting a false null hypothesis with a two-tailed t-Test c) the direction of the two-tailed t-Test must be stated a priori d) two-tailed t-Test is a directional test e) there is basically no difference between the two f) the advantage of the one-tailed t-Test is that we can state the alternate hypothesis after performing the test