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.

Question

Quizplus · Accepted Answer

[x̅ ± t_α_/2,_n₋₁(s/)] = [11.6 ± 1.96(4.1/15)] = [11.6 ± .5357] = [11.06, 12.14]

Unoccupied Seats on Flights Cause Airlines to Lose Revenue