A statistical tool used in education normalizes grade distributions. This type of instrument aims to adjust scores so they conform to a normal distribution, often represented visually as a bell curve. For example, if a class performs poorly on an exam, the instructor may use this tool to adjust the grades upwards, ensuring a more balanced distribution reflecting relative student performance rather than absolute scores.
The purpose of employing this methodology is to mitigate the effects of unduly difficult assessments or biased grading practices. It seeks to ensure that a predetermined percentage of students achieve specific letter grades, preventing situations where a significant portion of the class receives low marks. Historically, this technique has been used to maintain consistency across different instructors teaching the same course, or when comparing cohorts across different academic years. Its benefit lies in creating a fairer assessment of student aptitude relative to their peers within a defined educational context.
