"In a study on alcohol and driving ability, half the subjects are given alcohol..." In this study, those subjects who are given the alcohol before driving the course comprise the controls group. This is further explained below.
Generally, Drivers' cognition, alertness, attention, judgment, and response may be affected by alcohol, which has a direct impact on their ability to drive.
In conclusion, "Half of the volunteers in a research on drinking and driving abilities are given alcohol." The control group is comprised of people who are administered the alcohol before driving the course.
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