The Business Manager of a Local Health Clinic Is Interested

Short Answer

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.
$\begin{array}{lcc}&\text { Health Clinic }&\text { Group Practice }\\\text { Sample size } & 50 \text { visits } & 45 \text { visits } \\\text { Sample mean } & \$ 21.00 & \$ 19.00 \\\text { Standard deviation } \sigma) & \$ 2.75 & \$ 3.00\end{array}$ Develop a 95% confidence interval estimate for the difference between the average fees of the two offices.