12) Suppose you wish to test the claim that μd, the mean value of the differences d for a population of paired data, is greater than 0. Given a sample of n = 15 and a significance level of α = 0.01, what criterion would be used for rejecting the null hypothesis?
A) Reject null hypothesis if test statistic > 2.602.
B) Reject null hypothesis if test statistic > 2.977 or < -2.977.
C) Reject null hypothesis if test statistic > 2.624.
D) Reject null hypothesis if test statistic < 2.624.