Question

A school supervisor wants to determine the percentage of students that bring their lunch to school.

Which of the following methods would assure random selection of a sample population?

A.
The supervisor should randomly select students from all grade levels taught at the school.
B.
The supervisor should survey all of the students enrolled in the school.
C.
The supervisor should randomly select one grade level and survey all of the students in that grade.
D.
The supervisor should select one grade level and survey randomly selected students from that grade.

Answer 1

Based on the fact that it says the school supervisor wants to determine how many students bring there lunch to school,you should focus on that right there it would help you for example


If she wants to survey the percentage for a certain grade level it would say something like

:The school supervisor wants to determine how many 8th (or said grade or grades) graders bring lunch to school

If it wanted to know a random selection then it would say something like : The school supervisor chose random students to survey how many took lunch to school what was the percentage then it would have a chart or something along the lines


Based on the information i've just provided for you try choosing between B and a