A band director is trying to decide what music to play for the halftime show. She surveys the marching band students to get their opinions about which music they would prefer. Which of the following sampling techniques would provide a stratified random sample that would accurately represent the students’ opinions? A) Have a computer randomly sort the band members, then select the first 30.
B) Randomly select 2 students from each type of instrument (trumpet, saxophone, clarinet, etc.).
C) Randomly pick a letter of the alphabet and survey every student whose last name begins with that letter.
D) Randomly pick a year of students (freshman, sophomore, junior, or senior) and survey every student from the selected group.