Which scenario exemplifies a negative correlation?

A negative correlation occurs when one variable increases while the other variable decreases. In this scenario, "As the number of hours watching TV increases, physical fitness decreases," illustrates this relationship clearly. The more time an individual spends watching TV, the less time they have available for physical activities, which typically lead to better fitness levels. This inverse relationship highlights how increased inactivity from excessive TV watching can negatively impact fitness.

In contrast, the other scenarios describe positive relationships where an increase in one variable corresponds with an increase in another, such as warmer temperatures leading to higher ice cream sales or increased studying resulting in higher test scores. These relationships do not exemplify a negative correlation since both involved variables move in the same direction rather than oppositely. Shyness and self-esteem could potentially show a negative correlation as well, but the clear and distinct example provided in the correct answer is more straightforward in illustrating the concept of negative correlation effectively.