Dr. Simmons tests the hypothesis that students who study in the room where they take their tests will perform better on the tests than students who study in other rooms. She requires one group to study in the classroom where the exam is given and another group to study in the library. All students take the test in the classroom, and their test performance is compared. In this example, where students study is the __________.
A. independent variable
B. dependent variable
C. manipulation
D. hypothesis
Answer: A
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