Which statistic,often used for understanding and evaluating standardized tests,measures the average variability around a mean?
A)Validity
B)Standard deviation
C)Norms
D)Percentile rank

Question

Quizplus · Accepted Answer

Standard deviation measures the average variability around the mean in a sample or population. Validity refers to how well a test measures what it is supposed to measure, norms provide a comparison to a reference group, and percentile rank indicates the percentage of scores that fall below a particular score. While these other statistics are important in evaluating standardized tests, they do not directly measure variability around a mean.

Which Statistic,often Used for Understanding and Evaluating Standardized Tests,measures the Average