Mr. Collins wants to evaluate the correlation between the amount of time a student spends studying for a test and that student's test score. Mr. Collins assigns each student in his class a specific amount of time to study (in increments of 10 minutes) and finds that every 10-minute increase in study time improves a student's test scores by 2 points above the class average from the previous test. If Mr. Collins records the amount of time each student studied and what his or her score was on the test, what is the independent variable in this scenario?

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