What happened to the effective spread on trades when the SEC allowed the minimum tick size to move from one-eighth of a dollar to one-sixteenth of a dollar in 1997 and from one-sixteenth of a dollar to one cent in 2001?

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 example define natural rights ?

During the early period of spanish colonialism, the death of large numbers of native people led to what