After grading an examination, an instructor realizes there is a wide range of ability in her class. He realizes this because ______ than she expected.
A) the mean was higher
B) the range was smaller
C) the mean was lower
D) the standard deviation was higher

Question

Quizplus · Accepted Answer

The standard deviation measures the spread of the data, so a higher standard deviation indicates a wider range of ability in the class.

After Grading an Examination, an Instructor Realizes There Is a Wide