In a study analyzing the effectiveness of a new drug on reducing blood pressure, researchers formulated two hypotheses:
1. Null Hypothesis ($H_0$): The new drug has no effect on blood pressure, i.e., the population mean blood pressure (after treatment) is equal to the population mean blood pressure (before treatment).
2. Alternative Hypothesis ($H_1$): The new drug reduces blood pressure, i.e., the population mean blood pressure (after treatment) is less than the population mean blood pressure (before treatment).
If researchers collected a sample and found strong evidence to reject the null hypothesis, which of the following conclusions is most valid?