In a study of graduate students who took the Graduate Record Exam (GRE), the Educational Testing Service reported a correlation of 0.37 between undergraduate grade point average (GPA) and the graduate first year GPA.14 This means that
a. As undergraduate GPA increases by one unit, graduate first-year GPA increases by 0.37 unit.
b. Because the correlation is not 0, we can predict a person’s graduate first-year GPA perfectly if we know their undergraduate GPA.
c. The relationship between undergraduate GPA and graduate first-year GPA follows a curve rather than a straight line.
d. As one of these variables increases, there is a weak tendency for the other variable to increase also.