The average length of stay in a hospital after Kidney transplantation done is believed to be about 20 days. A random sample of 10 patients who has kidney transplanted at a Saint Paul's Hospital Millennium Medical College showed the number of days spent by each patient in the hospital as: 15, 20, 25, 21, 24, 18, 17, 20, 19, 21. A. Construct the 95% confidence interval for the average number of days spend after an open-heart surgery and interpret. B. Test the hypothesis that "The average length of stay in a hospital after kidney transplanted is believed to be about 20 days