The business manager of a local health clinic is interested in estimating the difference between the fees for extended office visits in her center and the fees of a newly opened group practice. She gathered the following information regarding the two offices.
Health Clinic Group Practice
Sample Size 50 visits 45 visits
Sample Mean $21 $19
Population Standard Deviation $2.75 $3.00
Develop a 95% confidence interval estimate for the difference between the average fees of the two offices