A large airline randomly selected a sample of 225 flight records and found a sample mean of 12.4 unoccupied seats per flight with a standard deviation of 4.7. What type of confidence interval should the airline use to make an inference about the population mean number of unoccupied seats per flight? [ Choose ] Government officials sampled 675 U.S. adults and found that 29% would consider traveling abroad for medical care because of medical costs. What type of confidence interval should these officials construct to estimate the population proportion of adults that would consider traveling abroad for medical care? [ Choose ]