A scientist is investigating how a new medication affects blood pressure. According to the researcher's hypothesis, the medication lowers blood pressure. The medication having no affect on the blood pressure is the null hypothesis. After gathering information from a selected group of patients, the researcher determines that the test statistic is -2.5. At the 0.05 significance level, the critical value for a one-tailed test is -1.645. What conclusion should the researcher draw from this data