correlational studies examples
1 Positive correlation: Positive correlation between two variables is when an increase in one variable leads to an increase in the other and a decrease in one leads to a decrease in the other. 2  For example, the amount of money that a person possesses might correlate positively with the number of cars he owns. Negative correlation: Negative correlation is when an increase in one variable leads to a decrease in another and vice versa. 2  For example, the level of education might correlate negatively with crime.