4 statistical psychology questions
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16) Chad conducted a study during which he asked 15 people to watch three movies, each
representing a different genre (comedy, action, and drama). He randomly assigned participants
to watch just one of the three movies. Five days after each movie viewing, he called participants
and asked them a ten questions about the movie they watched. For each movie viewed, he
recorded the number of questions each participant answered correctly.
a. What is the independent variable in this study? Why? (2 pts)
b. Is the independent variable a within subjects or between subjects variable? Why? (2
c. What is the dependent variable in this study? Why? (2 pts)
d. On what scale of measurement is the dependent variable? (1 pt)
17) In your own words, what are the key features of a factorial design that distinguish is from
other (experimental) research designs that we’ve discussed in the second half of the semester?
In your answer, please also discuss 1 specific advantage of a factorial design. (4 pts)
18) Describe/define the following 4 terms, being sure you describe the term well enough so that
your answer would allow me to distinguish that term from other similar terms and you situate
the term in the appropriate context. (2 pts each)
a) Manipulation check
b) Random assignment
c) Cohen’s d
Psychologist George Wood and his colleagues recruited people with low (variable A) and
high (variable B) self-esteem. After writing their thoughts and feelings down for 4 minutes, half
the participants were asked to repeat to themselves, “I am a loveable person” (condition 1)
the other half of the participants were assigned to a control group (condition 2).
a) Would you expect to find an interaction between Variables A and B? Why or why not? (2 pts)
b) For which of the two variables (A or B) might you expect to find a main effect? Why? (2 pts)
c) Interpret/describe the findings – how would you describe the results of this study in
conversational English to someone who has no statistical expertise? (2 pts)
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