Question

Next, she put a tablespoon of different pollutants, including gasoline, cooking oil, paint, and lawn fertilizer, in each of four of the tanks. She stirred those four tanks for 1 minute each to help the pollutant dissolve or spread out in the tank.

Finally, she tested the oxygen level in each tank once every hour and recorded her results in the table below.

Tank Pollutant
in water Initial
O2 level
(without pollutants) O2 level
after 1 hour O2 level
after 2 hours ...
1 none
2 gasoline
3 cooking oil
4 paint
5 lawn fertilizer

What is the dependent variable in Jenny's experiment?

Answer 1

meant to get to this earlier, sorry ;(

that being said, the dependent variable is what she is measuring/recording rather than what she is directly changing in the experiment, re-read the original problem and see which one that would be