A state health department wants to check for prevalence of t…
A state health department wants to check for prevalence of tick-borne diseases in the state. They decide to obtain blood tests from a sample of state residents as follows. There are 100 counties in the state. They randomly select 15 of these counties, then try to give blood tests to all residents (over the age of 5) of these counties. This type of sample is referred to as a