As a data analyst for the Quality Management group, in order to determine if these data are different from those of the prior 19 months due to special cause (the intervention) or continue showing random, common variation effects, what analysis do you need to perform? Which analytical approach will you use and why? How will you know if the intervention performed at St. Barbara medical Center was effective in helping them reach or move toward their goal? Are there any additional analyses you would perform to help the team understand the impact of their intervention?