The AMS technical services team has embarked on a quality improvement effort. Its first project relates to maintaining the target upload speed for its Internet service subscribers. Upload speeds are measured on a device that records the results on a standard scale in which the target value is 1.0. Each day five uploads are randomly selected, and the speed of each upload is measured. The results for 25 days is stored in AMS14.xl
a. Construct the appropriate control charts for these data.
b. Is the process in a state of statistical control? Explain.
c. What should the team recommend as the next step to improve the process?