Answer
This study is a clinical trial (examining the clinical efficacy of a new drug) which is a type of experiment. The researchers have followed the basic design for a clinical trial. They have a drug group and a placebo group, and the groups have been randomly assigned. The independent variable is the level of the drug, and the dependent variable is the level of hypertension. Based on the results of the study, the researchers probably have made the correct conclusion that the new anti-hypertensive drug is ineffective. Of course, this study should be replicated to further affirm the validity of the results.
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