You Want to Determine the Relationship Between Caffeine Intake and Performance

You want to determine the relationship between caffeine intake and performance on a mid-quarter exam. As students sit down to take the exam, you ask them to write the number of cups of tea, soda, or coffee they ingested two hours prior to the exam. You also obtain their exam scores. You calculate the correlation coefficient between the two variables to be +0.82. What can you conclude?

A) Higher caffeine consumption is related to higher exam scores.
B) Eighty-two percent of the students consumed caffeine prior to the exam.
C) Drinking coffee caused better scores.
D) The more caffeine students consumed, the worse they scored on the exam.

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