One reason to use standard scores instead of raw scores is:

Question

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Standard scores, such as z-scores or T-scores, allow for the comparison of scores from different distributions by transforming raw scores into a standardized form with a mean of 0 and a standard deviation of 1 or a mean of 50 and a standard deviation of 10, respectively. This transformation enables the comparison of scores across different tests or populations, which is not possible with raw scores. While standard scores can be used to calculate correlation coefficients and compare the standard deviation and mean, these are not the primary reasons why standard scores are used instead of raw scores.

One Reason to Use Standard Scores Instead of Raw Scores