Unoccupied Seats on Flights Cause Airlines to Lose Revenue

question 18

Multiple Choice

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 standard deviation of 4.1 seats. Calculate a 95 percent confidence interval for μ, the mean number of unoccupied seats per flight during the past year.

• A) [11.06, 12.14]
• B) [11.34, 11.86]
• C) [10.44, 12.76]
• D) [11.15, 12.05]
• E) [3.56, 19.64]

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