Hypothesis Testing and Confidence Interval for Mean using t Distribution

"1. Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively. 2. The Health Authority is worried that if the mean days absent in either clinic reach 20 days, it will have difficulties safely operating the clinics. Conduct separate hypothesis tests for Clinics A and B (at 95% confidence) that demonstrate whether they can be confident that absence is less than 20 days. "