Final answer:
The statement that best illustrates a negative correlation between the number of hours spent watching TV the week before an exam and the grade on that exam is an observation. Hence, D) is correct.
Step-by-step explanation:
The statement that best illustrates a negative correlation between the number of hours spent watching TV the week before an exam and the grade on that exam is option D) an observation.
A negative correlation means that as one variable increases, the other variable decreases. In this case, if the number of hours spent watching TV increases, the grade on the exam decreases. This suggests that spending more time watching TV is related to lower exam grades. However, it's important to note that correlation does not imply causation; there could be other factors at play that influence exam grades.