A program evaluator for a large school district wants to know how much intelligence varies in the elementary schools.She selects one classroom at each grade level in each elementary school and administers an intelligence test to the children in those classrooms.In order to find out which school has the most consistent intelligence level, which of the following should she calculate for each school?
A)The mean
B)The standard deviation
C)The sum of the deviations
D)The range

Question

Quizplus · Accepted Answer

The standard deviation is a measure of the amount of variation or dispersion of a set of values. To find out which school has the most consistent intelligence level, calculating the standard deviation of intelligence test scores for each school will show how much the scores vary from the average score within each school. A lower standard deviation indicates that the scores are more consistent or closer to the mean, while a higher standard deviation indicates more variability.

A Program Evaluator for a Large School District Wants to Know