Hospitals Are Very Interested in Improving Health Care Processes

Hospitals are very interested in improving health care processes. Many hospitals have begun to implement statistical process control techniques in order to monitor and improve their processes. One such hospital is using X-bar and R charts to monitor the turnaround time for stress tests. Turnaround time refers to the amount of time that elapses between the patient taking the test and the doctor receiving the results of the test. Use the following information to calculate the control limits and centerline for an X-bar and R chart. n = 6.