A teacher would like to know if the smell of orange reduces stress in her AP Psychology students. During her first period class, students take their exams in the room as normal. During her second period class, the teacher uses a diffuser and orange-scented essential oil while the students take their test. She then compares the test scores of the two classes.

Identify the following from this scenario:

Independent Variable:

Dependent variable:

Possibly Confounding Variable (s):