An airline wants to estimate the average number of unoccupie

An airline wants to estimate the average number of unoccupied seats per flight. A random sample of 70 flights is selected and the mean number of unoccupied seats is 5.6. Assume that the population standard deviation of unoccupied seats is known to be 2.1. Compute and explain a 95% confidence interval estimate of the population mean number of unoccupied seats per flight.

Solution

n = 105
x-bar = 9.6
standard deviation, ? = 2.9
Margin of error, E = s.e.