What distinguishes a good informative speech from a poor one?

An education expert is researching teaching methods and wishes to interview teachers from a particular school district. she randomly selects ten schools from the district and interviews all of the teachers at the selected schools. which type of sample did she use in this study? a)systematic sample b)probability sample c)stratified sample d)cluster sample

The right of the people to express their political views is protected in our govemment in many ways, including

What is one major role of political parties in u.s. politics