Winter is a bad season for the poor

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

Which of these best describes the works created by the hudson river school lainters

Do you think there should be more than two parties in the us political system, or does the us system work well?