For the following reports about statistical studies, identify the following items (if possible). if you can't tell, then say so-this often happens when we read about a survey.
(i) the population: the soil around the former industrial waste dump
(ii) the parameter of interest: the mean level of toxic chemicals in the soil
(iii) the sample: the 20 soil samples
(iv) the sample statistic: the mean level of toxic chemicals in the 20 soil samples.
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.