Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 71 with a mean of 42.7 and a standard deviation of 17.5. Enter your answer as an...

Assume that a sample is used to estimate a population mean μμ. Find the 80% confidence interval for a sample of size 71 with a mean of 42.7 and a standard deviation of 17.5. 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).


80% C.I. =



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