Determine which type of study design is described for each example. (Best answer). Group of answer choices One time correlation of physical activity and cholesterol levels [ Choose ] People who played college sports are followed for many years to determine how many died of heart attack. [ Choose ] People who have had knee replacements are interviewed to determine if they played vigorous sports in their youth. [ Choose ] Three groups are randomly assigned, Group1: performs 60 minutes of moderate intensity exercise 3 days per week, Group 2: accumulates 150 minutes of moderate intensity exercise a week; and group 3: performs no additional exercise [ Choose ]