Final answer:
Stacy's lower performance on actual exams compared to practice exams is likely due to test anxiety, as her study habits and understanding of material are proven to be effective in a quiet room setting.
Step-by-step explanation:
Stacy's discrepancy in exam performance is likely due to test anxiety. None of the provided options, such as lack of intelligence, poor study habits, or teacher bias, align closely with the described scenario of test performance differing by location.
Stacy's consistency in scoring well on practice exams in a quiet room, suggesting that she understands the material and has effective study habits. However, the stress or pressure she feels during the actual exams in a different environment could be impairing her performance.
Test anxiety commonly affects many students and can result in symptoms that distract from focusing on the test, such as increased heart rate, excessive sweating, and difficulty concentrating. This condition can be managed with strategies such as relaxation techniques, practice under simulated testing conditions, or seeking professional help.