cture.com/courses/154430/quizzes/316316/take D Question 21 2.5 pts The waiting time of 13 randomly selected patients at a hospital emergency room had a mean of 72.0 minutes and a standard deviation of 24.4 minutes. Assuming waiting time is approximately normally distributed, what is the 99.9% confidence interval for the population mean? O population mean = 72.0 +- 4.318 * (24.4 / sqrt(13)) O population mean = 72.0 +- 3.055 * (24.4 / sqrt(13)) O population mean = 72.0 +- 3.291 * (24.4 / sqrt(13)) O population mean = 72.0 +- 4.221 * (24.4 / sqrt(13)) O population mean = 72.0 +- 2.681 * (24.4 / sqrt(13))