Identifying IVs, DVs, and Study Designs
Identifying Independent and Dependent Variables,
Instructions: For each research description below, identify the independent variable and the dependent variable
1. A researcher hypothesizes that blondes really do have more fun.
Independent variable: ________________________________
Dependent variable: ________________________________
2. A developmental psychologist is testing the hypothesis that children in first grade know more words in the English language than children in Kindergarten.
Independent variable: ________________________________
Dependent variable: ________________________________
3. A clinical psychologist hypothesizes that people who have been diagnosed as having major depression will be more likely to also be diagnosed with an anxiety disorder than will people who have not been diagnosed with major depression.
Independent variable: ________________________________
Dependent variable: ________________________________
4. A pharmacologist is testing whether a new anti-anxiety medication, Moodcor, will cause people to gain weight.
Independent variable: ________________________________
Dependent variable: ________________________________
5. A developmental psychologist believes that if children successfully lie to their friends, they will be more likely to try lying to their parents.
Independent variable: ________________________________
Dependent variable: ________________________________
6. A personality psychologist believes that people who are more aggressive are more likely to purchase sports coupes than people who are less aggressive.
Independent variable: ________________________________
Dependent variable: ________________________________
7. A clinical psychologist hypothesizes that listening to an inspirational tape will lead one to be in a better mood.
Independent variable: ________________________________
Dependent variable: ________________________________
8. A clinical psychologist is testing his theory that people who experienced a brain injury are developmentally delayed to the age at which they experienced the injury (for instance, if one has a brain injury at the age of 10, that person will always act like they are 10).
Independent variable: ________________________________
Dependent variable: ________________________________
These are titles taken from articles in psychological journals. In the following titles,
identify the independent (IV) and dependent variables (DV):
a) Effects of witnessing conditions on the credibility of an eyewitness.
IV: DV:
b) Effects of behavior therapy on the classroom performance of children with attention-deficit hyperactivity disorder.
IV: DV:
c) Effect of meal composition on mood.
IV: DV:
d) Can kangaroo rats remember the location of food in the absence of odor?
IV: DV:
Answers (With Explanations)
1. IV: Hair colour
DV: Amount of fun
2. IV: Age (first grade or Kindergarten)
DV: Number of words known
3. IV: Whether one has depression or not
DV: Presence of anxiety disorder
4. IV: Getting the medication
DV: Weight gain
5. IV: Successfully lying to friends
DV: Lying to parents
6. IV: Aggressiveness
DV: Whether a sports coupe is purchased
7. IV: Whether one listens to the inspirational tape, or the white noise
DV: Mood
8. IV: Brain injury
DV: Age one is developmentally delayed
A – IV Witnessing conditions DV credibility
B – IV Behavior Therapy DV Classroom Performance
C- IV Meal Composition DV Mood
D IV Odor DV Kangaroo Rats memory
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