8. 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.
Can this be solved on a calculator?
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