Discover answers to your questions with Westonci.ca, the leading Q&A platform that connects you with knowledgeable experts. Connect with a community of professionals ready to provide precise solutions to your questions quickly and accurately. Get precise and detailed answers to your questions from a knowledgeable community of experts on our Q&A platform.

A medical researcher surveys all shoulder surgery patients
in each of 9 randomly selected counties in North Carolina.
Which type of sample does this represent?
O A. cluster sample
O
B. stratified sample
OC. convenience sample
O
D. simple random sample