How does a low standard error of measurement affect test interpretation?

A low standard error of measurement (SEM) indicates that there is a small amount of error associated with the observed test scores. This error reflects the degree to which the test scores are expected to vary from the true scores. When the SEM is low, it implies that the observed scores are likely to be very close to the individual's true scores, meaning that the test is providing a reliable measure of what it is intended to assess. This reliability allows for greater confidence in interpreting the scores, as it suggests that any variations in scores are minimal and do not significantly detract from the accuracy of the results. Therefore, a low SEM enhances the validity of the test interpretation, reinforcing a closer alignment between observed scores and true scores.