Question

a study is conducted to see if a daily exercise intervention affects blood pressure among people with pre - hypertension. one hundred participants are recruited to participate, and half are randomly assigned to participate in the intervention while the others serve as a control group. what study design is being used? a epidemiological study b randomized controlled trial c animal experiment d placebo study e none of these

Explanation:

Se招募了100名参与者，其中一半被随机分配到干预组，另一半作为对照组。这符合随机对照试验的设计，在这种设计中，参与者被随机分配到不同的组以评估干预措施的效果。

Answer:

B. randomized controlled trial