Explain how the Standard Error of Measurement is used to create a confidence interval.

The SEM is used to create a confidence interval, a range within which the true score is likely to fall with a certain level of confidence (e.g., 95%). The confidence interval is typically calculated as Observed Score +/- (Z-score * SEM), where the Z-score corresponds to the desired confidence level. For a 95% confidence interval, the Z-score is approximately 1.96.