In a study about the effects of caffeine on student
scores, researchers collected data about amounts of
caffeine consumed prior to a test and test scores. They
represented the data in a graph.
Caffeine consumed (mg)
0
Test score (percentage)
What explanation could the researchers give about these factors?
A. There is no correlation between amount of caffeine consumed
and test score.
B. There is a correlation between caffeine and test score, but not
enough to show cause.
C. There is evidence that a decrease in the amount of caffeine
consumed caused a decrease in test scores.
D. There is evidence that an increase in the amount of caffeine
consumed caused a decrease in test scores.