0 Question 20 v Assume that a sample is used to estimate a population mean ,u.. Find the 99% confidence interval for a sample of size 70 with a mean of 47.4 and a standard deviation of 14.1. Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. > Next