Using Designs with More Than Two Levels of an Independent

question 25

Multiple Choice

Using designs with more than two levels of an independent variable allows researchers to

• A)compare more than two kinds of treatment in one study.
• B)compare two or more kinds of treatment with a control group.
• C)compare a placebo group to the control and experimental groups.
• D)accomplish all of the other alternatives.

---

Definitions:

Serotonin

Serotonin is a neurotransmitter in the brain that influences various bodily functions, including mood regulation, appetite, and sleep.

Middle Frontal Gyrus

This part of the brain is involved in various functions, including attention, memory, and controlling movement.

Openness

A trait that reflects a person's willingness to consider new ideas and experiences.

Cortisol

A steroid hormone produced by the adrenal gland, often released in response to stress.