After grading an exam, an instructor realizes there is a very narrow range of ability in her class. He realizes this because ______ than she expected.
A) the mean was higher
B) the range was larger
C) the standard deviation was smaller
D) the median was wider

Question

Quizplus · Accepted Answer

A smaller standard deviation indicates that the scores are clustered closer together, meaning there is a narrow range of ability in the class.

After Grading an Exam, an Instructor Realizes There Is a Very