Airlines overbook flights so that no-shows do not cost the airline lost revenue. Suppose an airline estimates its average number of unoccupied seats per flight over the last 12 months by randomly selecting records from 225 flights. The mean unoccupied seats per flight is 11.6 with variance of 16.81 timate the mean number of unoccupied seats per flight for the past 12 months using a 90% confidence interval. So what? a) Es