A researcher was interested in utilities provided by citygovernments. The researcher randomly selected 20 counties from alist of all counties in the U.S. From each of these counties theresearcher then contacted each city government (a total of 192) andfound that 12 (6.25%) of them provided electricity to theirresidents. 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%.
