create X-bar charts and explain

6. At an outpatient clinic the management decided to take random sample comprising 30  ambulatory patients on each weekday for four weeks to study the patients waiting times and assess if the quality requirement for patient waiting times was met. The employees at the clinic were not aware of this investigation. The waiting time of each patient was recorded. Thus 20 samples each comprising 30 randomly  selected waiting times were recorded. Create X-bar and s charts and explain.  Activate all the tests and explain. The patient expectation is 20 minutes. What is the capability of the process.