Question: how to calculate confidence interval from sem?
Answer: Confidence Intervals The person's true score lies between 98 and 102. What is the 95% confidence interval for the same data? Using the formula for the 95% CI gives a range from 96.08 to 103.92: 95%CI = Score ±(1.96*SEM) = 100 ± (1.96*2) = 96.08 / 103.92.