Research that involves determining the association between two variables or two sets of variables is called research.

Research that involves determining the association between two variables or two sets of variables is called correlational research. This type of research seeks to identify relationships between variables without manipulating them, allowing researchers to observe and measure how changes in one variable may be related to changes in another.

Correlational research is crucial in various fields such as psychology, sociology, and health sciences, as it helps to establish patterns and predictions. However, it's important to remember that correlation does not imply causation, meaning that while two variables may be associated, it does not mean that one causes the other.

Additionally, various statistical methods, such as Pearson's correlation coefficient, can be used to quantify the strength and direction of the relationship between the variables. This type of research is foundational in developing hypotheses and guiding further experimental studies.