A researcher investigated the relationship between alcohol intake and reaction time in a driving simulation task. Participants drank either one ounce or three ounces of alcohol and were then measured on braking speed at a simulated red light. The independent variable was the:. A- alcohol intake
B- braking speed
C- reaction time
D- driving simulation task

The independent variable was the:

A- alcohol intake.

Explanation:

The dependent variable in a study is the one being measured by that study. The independent variable is the factor researchers control or change in order to affect the dependent variable. In the study described in the question, the researcher wished to measure the reaction time of participants. The independent variable, the factor that was changed to influence the reaction time, was the alcohol intake. Some participants drank one ounce, while others had three ounces of alcohol.

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