The geriatrics inpatient unit has experienced a significant amount of nursing staff turnover. In the last 12 months, seven of the 29 permanent RN staff members have left. In addition, the number of falls on the unit has risen from an average of two per month to a high of 11 falls last month. How could you calculate whether there is a significant relationship between staffing and patient safety issues? Can you accurately determine cause or effect in this situation? What is the clinical significance of these results?