Question

a direct relationship exists when:
a. there is no association between two variables.
b. one variable increases and the other variable increases.
c. one variable increases and there is no change in the other variable.
d. one variable increases and the other variable decreases.

Explanation:

A direct (positive) relationship between two variables means that as one variable changes in a positive direction, the other variable follows the same positive trend. Option a describes no relationship, option c describes a null association, and option d describes an inverse (negative) relationship. Only option b matches the definition of a direct relationship.

Answer:

b. one variable increases and the other variable increases.