27. Consider the following statements: I. There is strong evidence of a relationship between right hippocampus volume and score on the Wechsler Memory Scale. II. More than 50% of the variation in Memory Scale score can be explained by the linear rela- tionship with right hippocampus volume. III. The null hypothesis that corresponds to the p-value of .00170 in the output is Ho: 31 = 0. IV. The correlation coefficient (r) is positive. How many of these four statements are true? (a) 0 (b) 1 x (0) 2 (d) 3 (e) 4