Question: 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

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.

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