A toothache is a pain in or around a tooth that may be caused by: 1  Tooth decay. 2  Abscessed tooth. 3  Tooth fracture. 4  A damaged filling. 5  Repetitive motions, such as chewing gum or grinding teeth.
A correlational study determines whether or not two variables are correlated. This means to study whether an increase or decrease in one variable corresponds to an increase or decrease in the other variable.
You use a correlational design to study the relationship between two or more variables or. to predict an outcome. The history of correlational research draws on the themes of the origin and development of the. correlation statistical test and the procedures for using and interpreting the statistical test.