RAT 1 Practice Quiz
The hypothesis,“People who exercise frequently
get fewer colds”, exercise can be called
A.
B.
C.
D.
Predictor
Criterion
Third variable
Independent variable
1. A
• Frequency of colds is the criterion in this
example
2. Use of team based learning in classroom is found to
increase retention but I speculate that it is not TBL per
say but collaboration that increases retention.
Collaboration might be called
A.
B.
C.
D.
Moderator
Internal validity threat
External validity threat
A third variable
2. D
• Collaboration is a third variable and a possible
mediator because it might be responsible for
(or account for) the relationship between TBL
and retention.
3. Linear regression is used to examine fruit
eating and fruity behavior. The slope of a
regression line is found to be significant (β =
.78). What can I infer?
A. Eating fruit leads to fruity behavior
B. People who exhibit fruity behavior (fruits)
tend to eat fruit
C. Fruit causes fruity behavior
D. As fruit consumption increases so does fruity
behavior
E. B and D
3. E
• A and C are causal inferences. Linear
regression and correlations do not allow us to
infer cause.
4. Which of the following are true of
Homoscedasticity?
A. It is violated when the points of error around
the regression line are not normally
distributed
B. It is not an assumption of linear regression
C. It is an assumption of Pearson’s correlation
coefficient.
4. A
Dr. Hughes found that students in research
methods love learning about correlations.
Though this relationship only holds on sunny
days. Sunny days might be called?
A.
B.
C.
D.
A correlation
A mediator
A third variable
A confound
5. C
• Sunny days is a third variable and a moderator
(the relationship depends on weathers)
6. Which of the following research
questions is best suited for correlational
research?
A. Are people who are depressed less satisfied
with their relationships than non-depressed
people?
B. Do memory games improve test taking
ability?
C. Under what conditions is someone likely to
help a stranger?
D. Do political attitudes predict voting
behavior?
6. D
• A is a quasi experiment. It is correlational
because there is no random assignment, but
it’s a ‘fake’ experiment because people are put
into groups.
• B and C are experimental questions because
they require causal explanations
7. The relationship between thoughts
about Poppie and spinach eating was r
= -.56. This means
A. The more people ate spinach the more they
thought about Poppie
B. There was no relationship between eating
spinach and thoughts about Poppie.
C. Thoughts about Poppie decreases as more
spinach was eaten
D. Thought about spinach increased when
people stopped eating Poppie candies.
7. C