Freedom Hospital is in the midst of contract negotiations with its resident physicians. There has been a lot of discussion about the hospital's ability to pay and the way patients are charged. The doctors' negotiator recently mentioned that the geriatric charge system does not make sense and there may be a difference in the way males are charged versus females. To look into this, the hospital has collected a random sample of patient data for 138 patients. The data are in the worksheet named Freedom Hospital. The operations manager wants your team to use this data to develop a 95% confidence interval estimate for the difference in average charges. To complete Question 4 you should follow the steps below in parts a through m.