Suppose You Have Composed the Following Study Hypothesis: There Is

Suppose you have composed the following study hypothesis: There is a positive relationship between grades in school (measured numerically rather than by letters) and scores for self-esteem. What statistic would be appropriate for testing this hypothesis?

A) Chi-square, which examines the relationship between two variables where each is measured at the nominal level.
B) Independent t test, which examines the relationship between one dichotomous variable and one variable measured at the interval level.
C) Paired t test, which examines a set of matched scores for one group of people.
D) Pearson correlation coefficient, which examines the relationship between two variables where each is measured at the interval level.