780 patients suffering from high blood pressure were randomly assigned to one of three groups.Over a four-month period,the first group received an experimental drug,the second group received a placebo,and the third group received no treatment.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.The biggest decrease in blood pressure was for those who received the drug.
A)Retrospective observational study
B)Prospective observational study
C)Experiment

Question

Quizplus · Accepted Answer

This is an experiment as the researcher randomly assigned participants to different treatment groups and observed the effect of the drug on their blood pressure. The use of a placebo group and a no treatment group provides a control for comparison and reduces the influence of confounding variables. The experimental design allows for causal inference, as the researcher can infer that the drug caused the decrease in blood pressure in the treatment group.

780 Patients Suffering from High Blood Pressure Were Randomly Assigned