Dr.Branch would like to study the relationship between room lighting and college students' test performance.He randomly assigns college students to two groups.The first group takes an exam in a dimly lit room and the second group takes the same exam in a regularly lit room.What is the independent variable?
A) room lighting
B) exam scores
C) random assignment
D) Dr.Branch

Question

Quizplus · Accepted Answer

The independent variable is the variable that is intentionally changed in an experiment, in this case, the room lighting. The dependent variable is the variable that is affected by the independent variable, which is the students' test performance in this experiment. The other answer choices, such as exam scores and random assignment, are not the independent variable but rather the dependent variable and a method of experimental control, respectively. Dr. Branch is not a variable in this experiment.

DrBranch Would Like to Study the Relationship Between Room Lighting