Estimating a Population Mean

Use the confidence level and sample data to find a confidence interval for estimating the population. Round your answer to one decimal place. 1. 37 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 10.3 pounds and the population standard deviation is assumed to be 2.4 pounds. What is the 95% confidence interval for the true mean weight of all packages received by the parcel service? e - . Write the conclusion: 2. A group of 59 randomly selected students have a mean score of 29.5 with a sample standard deviation of 5.2 on a placement test. What is the 90% confidence interval for the mean score of all students taking the test? 4 . M d2 5.2