Assume that a sample is used to estimate a population mean $\displaystyle \mu$. Find the 98% confidence interval for a sample of size 68 with a mean of 39.5 and a standard deviation of 21.6. 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).

98% C.I. =

Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.