This document discusses research design using a correlational method. It defines correlation as a statistical test to determine how consistently two or more variables vary together. Correlation can be used to test relationships between variables and make predictions. There are two main types of correlational designs: explanatory, which clarifies associations among variables at a single point in time, and predictive, which identifies variables that predict an outcome. Correlation determines whether the association between variables is positive, negative, or nonexistent. Researchers collect and analyze data from at least 30 participants measured on two variables to describe the relationship between variables without manipulation.