In my own words 3. How is correlation different from causality? Correlation is the statistical measure of the relationship between two variables. It shows the relationship between changes in one variable and changes in another. A cause-and-effect relationship between two variables is variables is referred to as causality. It implies that changes to one variable directly to another variable. To establish whether there is a genuine cause-and-effect relationship, more thorough analysis and supporting data such as experimental design or controlled studies are needed to establish causality