Unoccupied Seats on Flights Cause Airlines to Lose Revenue

question 21

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.225 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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