Question

the entire high school marching band is going on a field trip. the number of parent chaperones required depends on how many students are going, according to school district policy.
$p$ = the number of parent chaperones required on the trip
$s$ = the number of band students on the trip
which variable is the dependent variable?
$p$
$s$

Explanation:

A dependent variable relies on another variable. Here, the number of chaperones ($p$) depends on the number of students ($s$), so $p$ is dependent.

Answer:

$p$