The Environmental Protection Agency took soil samples at 16 locations near a former industrial waste dump and checked each for evidence of toxic chemicals. They found no elevated levels of any harmful substances.
Identify the following items (if possible). If you can't tell, then say so—this often happens when we read about a survey.
a) The population
b) The population parameter of interest
c) The sampling frame
d) The sample
e) The sampling method, including whether or not randomization was employed
f) Who (if anyone) was left out of the study.
g) Any potential sources of bias you can detect and any problems you see in generalizing to the population of interest