The National Highway Traffic Safety Administration found the U.S. average EMS response time from EMS notification to arrival at the crash scene in urban areas to be 6.85 minutes. A random sample of 20 reported fatal crashes in South Dakota had a mean notification-to arrival time of 5.25 minutes with a standard deviation of 2.78 minutes. Find the 98% confidence interval for the true mean notification-to-arrival time in South Dakota if response times are considered nearly symmetrical.