Chapter PIII, Problem 4RE

To determine

To find: that it is an observational study, sample survey or an experiment and all the parameter of this study and survey and types of conclusions could be reached on the basis of given data.

Explanation of Solution

Researchers have data on radon gas. It is a test of samples. All houses on the property tax list are the population and the interest parameter is the radon pollution level.

In the survey, the sampling technique is not clearly granted, but the researcher can apply the stratified random sampling approach by diving into many areas in homes. The researcher follows this sampling method accurately: officials will use the results of the sample to draw inferences about the extent of pollution of radon in other homes in the country.