As the value of one variable increases, the value of the second variable also increases. The correlation coefficient will then be

When one variable rises and the other rises too, the correlation coefficient is positive.

A negative coefficient would mean one variable rises while the other falls.

A zero coefficient would mean no linear relationship between the variables.

Undefined does not describe a normal linear correlation between two variables.

A positive coefficient lies between zero and plus one in value.

A value near plus one signals a strong positive linear relationship.