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.
Ans: D
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