A student decides to be the subject in her own experiment. She wants to know how the amount of time she spends studying for a test affects the grade she makes on the test. For one semester she keeps careful records of time spent studying and the resulting test grade. She makes a scatter plot of her results.
What type of variable is study time in this experiment?
controlled variable
responding variable
test variable (independent variable)
outcome variable (dependent variable)
![A student decides to be the subject in her own experiment She wants to know how the amount of time she spends studying for a test affects the grade she makes on class=](https://us-static.z-dn.net/files/ddd/bb1d40f54a338d658ac0a2eba218b67a.png)