Score: 18/24 9/12 answered Question 10 Assume that a sample is used to estimate the life expectancy for males in a certain county. Find the 80% confidence interval for a sample of size 2000 with a mean of 76.7 years and a standard deviation of 19.7 years. 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. Question Help: Message instructor Submit