What is the purpose of using t-scores?

The purpose of using t-scores primarily relates to standardizing test scores to allow for easier comparison across different assessments. A t-score has a defined mean (typically set at 50) and a standard deviation (usually set at 10). This conversion process transforms raw scores into a more interpretable format, making it easier to understand an individual's performance in relation to a larger group.

By using this standardized scale, educators and psychologists can quickly ascertain how a person's score compares to the average performance of the normative group, facilitating more informed decisions regarding educational placements or interventions. T-scores are especially valuable in psychological testing, where direct comparison of scores can reveal significant insights about a student’s abilities or challenges.

The appeal of providing a mean of 50 with a standard deviation of 10 lies in its ability to produce a consistent framework for interpreting scores, enhancing clarity in educational assessments.