Question at position 39 A professor presents a test in black ink for half the students and in red ink for the other half, and compares the students' test scores. What is the dependent variable in this experiment?The students' test scoresThe difficulty of the testThe number of students in each groupThe color of ink on the testSingle choice
A
The students' test scores
B
The difficulty of the test
C
The number of students in each group
D
The color of ink on the test
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