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...

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

a. What is your conclusion? Use a= 0.05.

b. Develop a 95% confidence interval estimate for the difference between the average fees of the two offices.