Question

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

Answer 1

Sample frame is the list of all counties in the U.S

Explanation:

A sample frame refers to the set that lists all the individuals that could eventually be part of the selected random sample and, in fact, is used to make the selection of the sample units.

Taking into account the definition commented in the previous paragraph, in the situation described, the sample frame is the list of all counties in the U.S