Assume that a sample is used to estimate a population mean μμ. Find the 99.9% confidence interval for a sample of size 40 with a mean of 50.1 and a standard deviation of 11.9. Enter your answer as an...

Assume that a sample is used to estimate a population mean μμ. Find the 99.9% confidence interval for a sample of size 40 with a mean of 50.1 and a standard deviation of 11.9. Enter your answer as anopen-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place)