Question

Assume that a sample is used to estimate a population mean μ μ . Find the 90% confidence interval for a sample of size 485 with a mean of 63.9 and a standard deviation of 13.1. Enter your answers accurate to four decimal places. Confidence Interval = ( , )

LicenseQuestion 18. Points possible: 1 Unlimited attempts. Post this question to forum Incorrect but can retry You measure 50 textbooks' weights, and find they have a mean weight of 75 ounces. Assume the population standard deviation is 14.3 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Keep 4 decimal places of accuracy in any calculations you do. Report your answers to four decimal places. Confidence Interval = (，）

Answer 1