In a study designed to test the impact of nicotine on driving ability, smokers are asked to "drive" using a computerized driving simulator equipped with a stick shift and a gas pedal. Some of the participants smoke a real cigarette immediately before climbing into the driver's seat. Others smoke a fake cigarette without nicotine. You are interested in comparing how many collisions the two groups have. In this study, which participants were in the experimental group, and which were in the control group?
▸ The participants who smoke a cigarette without nicotine comprise the control group; the participants who smoke a cigarette with nicotine comprise the experimental group.
▸ The participants who smoke a cigarette with nicotine comprise the control group; the participants who smoke a cigarette without nicotine comprise the experimental group.
▸ This study does not have an experimental group; the participants who smoked either a cigarette with or without nicotine were in the control group.
▸ This study does not have a control group; the participants who smoked either a cigarette with or without nicotine were in the experimental group.