A negative correlation is when the points on a graph lead generally downward. For example, a negative correlation could be the amount of sunlight each hour after 5 p.m. Every hour it gets later, the less sun there is, so the graph for that situation would slope downwards. Another example could be the number of tickets bought at each higher price. Say you have 3 types of tickets available, premium, deluxe and double. The premium are the cheapest, the deluxe are a little more expensive, and the double cost the most. The number of people buying the more expensive kinds of tickets is fewer, therefore the graph of that situation would slope downwards.
