PSYCH 610 Week 4 Individual Assignment Week Four Homework Exercise (UOP)
PSYCH 610 Week 4 Individual Assignment Week Four Homework Exercise (UOP)
Answer the following questions, covering material from Ch 8-10 of Methods in Behavioral
Research:
1. What is a confounding variable and why do researchers try to eliminate confounding
variables? Provide two examples of confounding variables.
2. What are the advantages and disadvantages of posttest only design and pretest-posttest
design 3. What is meant by sensitivity of a dependent variable? 4. What are the differences
between an independent groups design and a repeated measures design? 5. How does an
experimenter's expectations and participant expectations affect outcomes? 6. Provide an
example of a factorial design. What are the key features of a factorial design? What are the
advantages of a factorial design? 7. Describe at least four different dependent variables. 8.
What are some ways researchers can manipulate independent variables? 9. What is the
difference between main effects and interactions?
How do moderator variables impact results? Provide an example. 10. A researcher is
interested in studying the effects of story endings on preference ratings. He randomly assigns
participants into two groups: predictable ending or surprise ending. He instructs them to read
the story and provide preference ratings. The experimenter's variation of story endings is a
Straightforward (straightforward or staged) manipulation. 11. A researcher was
interested in investigating the vocabulary skills of 6th graders in a program for gifted students.
She gave a group of participants a test of vocabulary that was aimed at the 7th-grade level.
She quickly discovered that there was limited variability in the scores because nearly all the
students answered 90% or more of the questions correctly. This outcome is called a
Ceiling effect
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