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 in those counties (a total of 192) and found that 12 (6.25%) of them provided electricity to their residents.Which of the following are true?Select all that apply.
1) The population of interest is all city governments in the U.S.
2) The population of interest is the 192 cities.
3) The population of interest is all city governments that provide utilities to their residents.
4) The population of interest is 6.25%
5) The parameter of interest is the proportion of the city governments in the U.S. that provide electricity to their residents.
6) The parameter of interest is 6.25%
7) The population of interest is the 20 counties.
8) The parameter of interest is the list of all counties in the U.S.