a hospital emergency room (er) director is investigating wait times for er patients. the following wait times (in minutes) are measured for a sample of 5 patients: 30, 10, 20, 5, 10 e) Assuming a normal population, use the 5-patient sample to find a
95%
confidence interval for the true average wait time (in minutes) for ER patients at the hospital. f) A follow-up study consists of recording wait times for a sample of 61 patients, which results in a sample mean of 18 minutes with standard deviation 9 minutes. Using this new sample, find a
98%
confidence lower bound for the true average wait time for ER patients at the hospital. g) Based on the statistical estimations made in this problem, is there significant evidence against a claim that the true average wait time is 12 minutes?