Senturia et al. (1994) describe a survey taken to study how many children have access to guns in their households. questionnaires were distributed to all parents who attended selected clinics in the chicago area during a one-week period for well or sick child visits.
a. suppose that the quantity of interest is percentage of the households with guns. describe why this is a cluster sample. what is the psu? the ssu? is it a one-stage or two-stage cluster sample?
b. what is the sampling population for this study? do you think this sampling procedure results in a representative sample of households with children? why, or why not?