According to their grade on the first midterm, an instructor identifies the 10 best students among his class of 100. Their average grade is A-. After the next examination he reviews their performance. He will probably find that their average grade on the second test will be
A) higher
B) about the same
C) lower, but above average
D) about average

Question

Quizplus · Accepted Answer

This is an example of regression to the mean, where extreme performances tend to be followed by more average performances. The top 10 students may not perform as exceptionally on the second test, leading to a lower average, but still above the class average.

According to Their Grade on the First Midterm, an Instructor