. Question 1 v Assume that a sample is used to estimate a population mean ,u. Find the 80% confidence interval for a sample of size 71 with a mean of 50.8 and a standard deviation of 10.2. 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). Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Check