Refer to given Exercise. The quality improvement team, after a thorough study of the existing processes, recommended some procedural changes. Data collected after the changes yielded a mean turnaround time of 40 minutes with a standard deviation of 10 minutes. If the goal value is still 60 minutes, find an upper capability index assuming normality of distribution of turnaround times. In what proportion of time will the goal be met?
Exercise
A health care facility in a metropolitan area is interested in the efficiency of its laboratory turnaround time. Based on data collected over last year, the mean turnaround time was found to be 55 minutes with a standard deviation of 15 minutes.
The facility has set a goal value of 60 minutes. Find an upper capability index assuming normality of distribution of turnaround times. In what proportion of time will the goal be met?