What is a scaled score based on?

• A. Normal distribution in standard deviation units
• B. Raw score comparison
• C. Class average performance
• D. Individual performance only

Answer: (A)

A scaled score is a representation of an individual's performance on an assessment that is adjusted to account for differences in test difficulty and is based on a normal distribution in standard deviation units. This method allows for the comparison of scores across different groups or testing conditions by placing them on a consistent scale.

Using a normal distribution means that the scores are organized around a mean, and the standard deviation indicates how much scores vary from that average. This statistical approach helps to ensure that varying levels of difficulty in different test forms or versions are appropriately accounted for, resulting in a more reliable measure of a student's performance compared to others.

In contrast, raw score comparisons simply take the number of questions answered correctly without considering factors like test difficulty. Class average performance may provide insights into group outcomes, but it does not provide an individualized score. Individual performance only focuses on a single test taker's results without placing them in a broader context, which lacks the normalization process that scaled scores use.