Amy and Becky Are Students in the Same Spanish Class

Short Answer

Amy and Becky are students in the same Spanish class and have always been equally proficient in the subject. As part of an experiment, a scientist claiming to have specialized knowledge tells their teacher that Amy is likely to surpass Becky in reading comprehension by the end of the year. Even though this advice has no basis, sure enough, Amy ends up earning a better grade in reading comprehension than Becky. What might be the explanation for this?