In a laboratory, smokers are asked to "drive" using : computerized driving simulator equipped with
a stick shift and a gas pedal. The object is to maximize the distance covered by driving as fast as
possible on
winding road while avoiding rear-end collisions. 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.
What is the independent variable and what is the dependent variable in this experiment?