Unoccupied Seats on Flights Cause Airlines to Lose Revenue

Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number of unoccupied seats per flight over the past year. Two hundred and twenty-five flight records are randomly selected and the number of unoccupied seats is noted, with a sample mean of 11.6 seats and a population standard deviation of 4.1 seats. How many flights should we select if we wish to estimate μ to within 5 seats and be 95 percent confident?

A) 44
B) 3
C) 2
D) 110
E) 6

Correct Answer:

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