Assume that a sample is used to estimate a population mean . Find the 99% confidence interval for a sample of size 48 with a mean of 25.8 and a standard deviation of 9.7. 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). 99% C.I. - (1) invalid interval notation. Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Submit Question