Principal of the middle school claims that mean test score of seventh-graders at his school is higher than 72.1. You want to test the claim at 0.05 level of significance. Mean score for the random sample of 100 seventh-graders is 75.7 with the standard deviation of 15.2. What criterion would be utilized for rejecting null hypothesis, provided claim that µ > 72.1? Suppose that standard deviation of population, sigma, is known. Reject Ho if test statistic > 1.645. Reject Ho if test statistic > 1.96 or < -1.96. Reject Ho if test statistic > 1.96. Reject Ho if test statistic < 1.645.