Identifying the Dependent Variable
A researcher designed a study to determine whether consuming coffee before training increases athletic performance. She established two groups: one group drank coffee prior to training, while the other did not. She then measured the athletes' performance in terms of miles run per hour. What is the dependent variable in this study?
AThe number of athletes in each group
BWhether or not the athletes consumed coffee
CNone of the above
DThe athletes' performance in terms of miles run per hour