PC Magazine asked all of its readers to participate in a surveyof their satisfaction with different brands of electronics. In the 2004 survey, which was included in an issue of the magazine that year, more than 9000 readers rated the products on a scale from 1 to 10. The magazine reported that the average rating assigned by 225 readers to a Kodak compact digital camera was 7.5. For this product, identify the following:
 
A. The population 

B. The parameter of interest 

C. The sampling frame 

D. The sample size 

E. The sampling design 

F. Any potential sources of bias or other problems with the survey or sample