An experiment is being conducted to determine the effects of caffeine intake on student performance.One group is made to drink 5 cups of coffee,the other group drinks 1 cup of coffee.They then take the exam.The independent variable is _____.
A) the amount of caffeine consumed.
B) the group membership.
C) how alert the students are during the exam.
D) the students performance on the exam.
Correct Answer:
Verified
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