Final answer:
The consistency in Katrina's SAT Math scores suggests that the SAT has high test-retest reliability, meaning it reliably produces similar scores over time.
Step-by-step explanation:
Katrina received a 740 on her Math SAT and later a 720. The consistency in her scores indicates the SAT has high test-retest reliability. This term refers to the ability of a test to produce stable and consistent results over multiple administrations under similar conditions. High test-retest reliability suggests that the scores are reliable and not due to random chance or testing irregularities.
The SAT is designed to have a high degree of predictive validity, which implies that it can effectively forecast a student's potential for first-year college success, as measured by their GPA. However, even with the significance placed on these scores in college admissions, debates continue over their fairness and actual predictive power.
Given the context of the question and the description provided, the option that best explains why Katrina's scores are similar is: a) Test-retest reliability.