Correlation is a single numerical value that explains the relationship between two variables. The link that occurs between high school performance and numbers of hours taken while playing video games is an example of a correlation. The two variables in the study are hours spent playing video games and high school performance among students. There are two directions in the correlation between any two variables in a study, and this encompasses positive and negative correlation. Negative correlation takes place when an increase in one particular quantity results to a decrease in the other quantity. With an increase in the number of hours taken by students while playing video games, a reduction in their academic performance becomes the possible outcome.

When two variables have a negative correlation in mathematics, it is referred to as an inverse relationship. The term shows that when one variable increases, the other decreases, and vice versa. Vice versa in the example above would imply that at the same time when increased performance is observed among high students, then there is a possibility that the students have reduced the number hours they take while playing video games. A negative correlation is often indicated with a minus (-) sign, and this is placed in front of the correlation value.

In the example, it is coherent that students who spent a higher amount of time while playing video games every week always have the lowest GPAs. At the same time, it is observed that as the number of hours spent while playing video games decreases, the GPA increases. Therefore, there is a correlation between the hours of playing video games and overall school performance. The two variables are said to be correlated since a change in one variable causes a change in the other variable. Overall High School performance and number of hours taken while playing video games are two variables which are negatively correlated.

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