Agovernment organization is examining the effectiveness of a program intended to shorten security lines at airports for "trusted travelers". For comparison purposes, a sample was obtained of the time in seconds it took passengers not on the program to pass through security at a certain international airport. The accompanying data contain the results. Complete parts a through c below. a Click the icon to view the security time data. a. Calculate the sample mean and the sample standard deviation for this sample of passenger times. The sample mean is D seconds. (Round to two decimal places as needed.) The sample standard deviation is D seconds. (Round to two decimal places as needed.) b. Assume that the distribution of time required to pass through security at this airport is normally distributed. Use the sample data to construct a 90% condence interval estimate for the average time required to pass through security. The 90% condence interval is D seconds (Round to two decimal places as needed.) El seconds. c. What is the margin of error for the condence interval constructed in part b? e = t D seconds (Round to two decimal places as needed.)