In: Math
A researcher was interested in utilities provided by city governments. The researcher randomly selected 20 counties from a list of all counties in the U.S. From each of these counties the researcher then contacted each city government (a total of 192) and found that 12 (6.25%) of them provided electricity to their residents. In this situation the sampling frame is
Select one:
a. the list of all counties in the U.S.
b. the 316 cities.
c. the 20 counties.
d. 6.25%.