Which statistic describes how far a student's score deviates from the mean on a standardized assessment?

• A. Standard score
• B. Mean
• C. Standardized test
• D. Deviation

Answer: (A)

A standard score expresses how far a student’s score is from the mean, in units of the standard deviation. This normalization allows you to compare results across different tests or forms because every score is placed on the same scale relative to how scores typically spread. A standard score tells you not just whether the score is above or below average, but by how much, in terms of variability shown by the standard deviation. It’s common to describe it as how many standard deviations above or below the mean the score falls (often called a z-score). By contrast, the mean is just the center of the distribution, not a measure of deviation; a deviation alone is the raw difference from the mean and doesn’t account for how spread out scores are; and a standardized test is the type of assessment, not a statistic describing distance from the mean.