The average percent of patients exceeding acceptable waiting time was 3.7% (see table for question number 91). The calculated UCL is 9.4. When you plot the upper and lower limits, what would you suggest as the reason for the June variation?

Question

Quizplus · Accepted Answer

The fact that the calculated UCL is 9.4 suggests that there may have been a special cause variation in June, as the percent of patients exceeding acceptable waiting time was higher than usual. A special cause variation can occur due to a specific event or circumstance, rather than being within the normal range of common cause variation.

The Average Percent of Patients Exceeding Acceptable Waiting Time Was