In a laboratory, smokers are asked to drive using a computerized driving simulator and cover the maximum distance possible, while avoiding rear-end collisions. Some volunteers are given a real cigarette to smoke immediately before the test
Others smoke a fake cigarette without nicotine. The number of collisions the two groups make is to be compared. In this study, the independent variable is:
a. the use of nicotine.
b. the use of a driving simulator.
c. the number of collisions.
d. the speed of each driver.
Answer: a
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