Consider what you learned about surveys in this section. Imagine that you have been asked to design a survey to collect data about how often and why teenagers in your community use global positioning systems (GPS).

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal