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.
correlation. n. 1. a mutual or reciprocal relationship between two or more things. 2. the act or process of correlating or the state of being correlated. 3. (Statistics) statistics the extent of correspondence between the ordering of two variables. Correlation is positive or direct when two variables move in the same direction and negative or inverse when they move in opposite directions. [C16: from Medieval Latin correlÄtiÅ, from com-together + relÄtiÅ, relation]. (ËkÉr ÉËleÉª ÊÉn, ËkÉr-). n.