22. The Full Moon and Emergency Room Visits. Is there a difference in emergency room visits before, during, and after a full moon? A study looked at the admission rate (number of patients per day) to the emergency room of a Virginia mental health clinic over a series of 12 full moons. The data are provided in the table. Assume the data represent independent random samples. Is there evidence of a difference in emergency room visits before, during, and after the full moon? Test whether the population median number of emergency room visits is the same before, during, and after a full moon, using level of significance .