On the basis of findings related to elevated blood levels of cholesterol, a researcher wanted to determine whether a new drug would notably lower the blood levels of cholesterol in otherwise healthy persons. Which of the following studies would the researcher most likely use?

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Experimental design is used to test treatment and prevention strategies. Subjects are randomly assigned to the experimental group to obtain the new drug while the control group receives a placebo or alternative. The changes in blood cholesterol level would then be measured. A cross-sectional study examines relationships between potential causal factors and disease at a specific time. A prospective study monitors a group of disease-free individuals to determine if and when disease occurs. A retrospective study compares individuals with a particular condition or disease with those who do not have the disease.

On the Basis of Findings Related to Elevated Blood Levels