A hospital administrator monitors the rate of post-surgical infections to ensure that the rate of infection remains low over time. Hospital staff record the date of each post-surgical infection.
The administrator creates a G chart to monitor the rate of infections.
The event probability is 0.099. The event probability is the chance of an event occurring on any given day. For the infection data, the chance of an infection occurring on a given day is 9.9%. Two points failed the Benneyan test (3 points in a row are equal to 0), which indicates that 3 or more infections were recorded on the same day.