A researcher was interested in the relationship between education and income. After collecting data, she found a strong positive relationship between (X) the number of college semesters a person has completed, and (Y) weekly income. This demonstrates that: semesters in college is one factor which causes higher incomes. semesters in college is one factor which causes lower incomes. as the # of semesters increases, income tends to increase. as the # of semesters increases, income tends to decrease