Final answer:
Variables that have shown consistently good predictive validity include SAT scores and the correlation between math exam grades and final exam grades.
Step-by-step explanation:
Predictive validity refers to the ability of a variable to accurately predict future outcomes. There are several variables that have shown consistently good predictive validity. One example is the SAT scores, which have been found to predict college success. Another example is the correlation between a student's math exam grades and their final exam grades, which can help predict their overall academic performance.