Claim: The mean systolic blood pressure of all healthy adults is less than than 120 mm Hg. Sample data: For 268 healthy adults, the mean systolic blood pressure level is 119.37 mm Hg and the standard deviation is 15.76 mm Hg. The null and alternative hypotheses are Ho: u = 120 and H, : u = 120. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)