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PSY550 Final Exam: Research Methods with solutions new update
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PSY550 Final Exam: Research Methodswith solutions new update
Instructions: This is an open-book and open-notes exam. You have 2 hours to complete the
exam. The test is worth 100 points; each item is worth 10 points.
1. Chuck Wagon is very excited about the within-subjects approach. “Now I’ll never need
to run large numbers of subjects again,” he says. However, Chuck has forgotten that within-
subjects designs may be a) useless, b) impossible, c) confounded by order effects, or d)
impractical when excessive subject time spent in an experiment makes data inaccurate. Give an
example of each of these four objections. Answer:
2. Explain the pros and cons of longitudinal, cross-sectional, and sequential designs.
Answer:
Longitudinal Pros: Shows developmental course, continuity and discontinuity, eliminates cohort.
Cons, they are expensive, long, practice effect and selective attribution.
Cross-sectional Pros: quick, cheap, demonstrates age difference. Cons; Cohort effect, doesn’t
show development process and doesn’t show if its continuous or
discontinuous.
Sequential Pros; can compare cohorts, not to expensive. Cons: Complicated
3. After watching nursery-school children, Ken Garoo wants to test the hypothesis that
some toysare more fun to play with than others. He decides to compare “fun” toys (blocks) with
“unfun” toys (stuffed animals). He also wishes to see if there is a sex difference, as well, so sex is
added as an independent variable. A) What kind of design is needed? B) Diagram it out. C)
Assuming 20 subjects are needed per cell, how many subjects are needed for this study?
Answer:
(a)
(b) (c)
4. Define the term quasi-experiment and discuss the pros and cons of this research
method. Answer: Quasi-experimental research makes observations in a study that is structured
similar to an experiment, but the conditions and experiences of participants lack some control
because the study lacks random assignment, includes a preexisting factor or does not include a
comparison/control group.
Pros: comparing scores before and after Cons: Lacks comparison /control.
5. Bill Board is “lording” his SAT score over his friend, Rhoda Dendron, who took the ACT.
“You only got a 25 in math,” he chortled, “while I got a 300 in math.” Given that the SAT has a μ
of 500 and a σ of 100, and the ACT has a μ of 20 and a σ of 5, what is wrong with Bill’s logic
(give the answer in both z scores and percentile ranks).
Answer:
Bill Board's Z-score is: (300 - 500)/100 = -2; whereas Rhoda Dendron's Z-score is: (25 - 20)/5 =
1. So, According to Z-score comparison, Rhonda has actually scored more than Bill.
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