Answer:
In probability theory and statistics, correlation, (often
measured as a correlation coefficient), indicates the strength
and direction of a linear relationship between two random
variables.
For
e.g. Tall people usually have larger arm spans than shorter
people. There is said to be a correlation between height and
arm span, although there is no exact formula connecting them.
When
two variables are such that as one changes the other changes
in a related way, they are said to be correlated.
