Final answer:
Based on a positive correlation between extraversion and agreeableness in the Big Five personality factors, Andy can assume Vanessa probably scores high on agreeableness.
Step-by-step explanation:
If Andy reads that extraversion correlates positively with agreeableness and he meets Vanessa who says she is very extraverted, Andy can assume that Vanessa probably scores high on agreeableness, based on the correlation. This assumption is drawn from the Big Five personality factors where extraversion is characterized by qualities such as sociability and warmth, and agreeableness includes being cooperative and good-natured. The positive correlation suggests that high levels of extraversion are often associated with high levels of agreeableness.