In a norm-referenced assessment, what is commonly used to compare scores?

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In norm-referenced assessments, percentiles are commonly used to compare scores because they indicate the relative standing of an individual score within a population. A percentile score tells you what percentage of scores fall below a particular score, making it a useful measure for understanding how a test-taker performed in comparison to others who have taken the same assessment. For instance, if a student is in the 75th percentile, this means they scored better than 75% of the students in the norm group, providing a clear context of their performance.

Other statistical measures, such as means or standard deviations, provide overall summary information about a group but do not directly offer insight into an individual's position relative to others. Raw scores, on the other hand, simply present the unadjusted number of points a test-taker earned, which lacks the comparative context provided by percentiles. Therefore, percentiles are the most effective way to convey how an individual's performance stacks up against their peers in a norm-referenced assessment.

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