We are interested in the average wait estimated time of our local ER at 7 PM on Friday nights. So, we sample 18 estimated wait times (in minutes) at 7 PM on Friday nights over the last 2 years and found the following: 3, 8, 25, 47, 61, 25, 10, 32, 31, 20, 10, 15, 7, 62, 48, 51, 17, 30 Using these ER wait times, construct a 90% condence interval for the mean ER wait times for Friday nights at 7 PM Discussion Prompts Answer the following questions in your initial post: 1. What is the sample mean and sample standard deviation of this data set? 2. Should we be using the Z or T distribution? Explain why 3. Find the Critical Z or T value for this problem. 4. Compute the Margin of Error, E Write out the condence interval 6. The ER claims its average wait time on Friday nights will be less than 35 minutes. Based on our condence interval, does this 9" seem like a valid claim