Assume that a sample is used to estimate a population mean μ. Find the 99% confidence interval for a sample of size 37 with a mean of 26.4 and a standard deviation of 9.9. 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. =
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.