Assignment 4: It is a cumulative review of the Units 7-10 1. To estimate the mean time that the customers spend in a privileged lounge at an airport, the time for 35 randomly selected passengers is monitored and the mean of this sample is 97 minutes and standard deviation is 23 minutes. a) Construct a 95% confidence interval for the mean time for all the passengers. b) Construct a 99% confidence interval for the mean time for all the passengers. c) Which of these intervals is wider?