Quisley's hypothesis is that listening to classical music improves intellectual performance. He randomly divided a mathematics class into two rooms. In room A, music by Mozart played softly in the background during a lecture. In room B, the students listened to a lecture without background music. The independent variable is
A. whether music played during a lecture.
B. mathematical performance.
C. the level of mathematics taught.
D. present only in the control group.
Answer: A
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