age Use the confidence level and sample data to find a confidence interval for estimating the population u. Round your answer to the same ry number of decimal places as the sample mean. A group of 61 randomly selected students have a mean score of 37.8 with a standard deviation of 3.8 on a placement test. What is the 90% confidence interval for the mean score, u, of all students taking the test? O 36.7 H 38.9 O 36.8 u 38.8 36.5 u 39.1 O 37.0 H 38.6