The following are airborne times (in minutes) for 10 randomly selected flights from San Francisco to Washington Dulles airport. 270 255 268 285 274 275 266 258 271 281 (a) Calculate a 90% confidence interval for the mean airborne time for flights from San Francisco to Washington Dulles. (Round your answers to three decimal places.) Interpret a 90% confidence interval for the mean airborne time for flights from San Francisco to Washington Dulles. We are 90% confident that the mean airborne time for flights from San Francisco to Washington Dulles is between these two values. O We are 90% confident that the true mean airborne time for flights from Washington Dulles to San Francisco is between these two values. O There is a 90% chance that the true mean airborne time for flights from Washington Dulles to San Francisco is directly in the middle of these two values. O There is a 90% chance that the true difference in the mean airborne time for flights from San Francisco to Washington Dulles is directly in the middle of these two values. O We are 90% confident that the true mean airborne time for flights from San Francisco to Washington Dulles is directly in the middle of these two values. (b) Give an interpretation of the 90% confidence level associated with the interval estimate in part (a). O If we were to take a large number of random samples of size 90, 10% of the resulting confidence intervals would contain the true mean airborne time. O If we were to take a large number of random samples of size 10, 10% of the resulting confidence intervals would contain the true mean airborne time. O If we were to take a large number of random samples of size 10, 95% of the resulting confidence intervals would contain