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Chapter 10

PSYB01H3 Chapter Notes - Chapter 10: Repeated Measures Design, Factorial Experiment, Dependent And Independent Variables

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Anna Nagy

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Answers for Chapter 10 Questions on Complex Experimental Designs
1. In a study by Chaiken and Pliner (1987), research participants read an “eating diary”
of either a male or a female stimulus person. The information in the diary indicated
that the person ate either large meals or small meals. After reading this information,
participants rated the person’s femininity and masculinity.
a) Identify the design of this experiment.
2 x 2
b) How many conditions are in the experiment?
c) Identify the independent variable(s) and the dependent variable(s).
IVs: Gender of the stimulus person and size of the meal
DV: Ratings of femininity and masculinity
d) Is there a participant variable in this experiment? If so, identify it. If not, can
you suggest a participant variable that might be included?
No In this case, gender of the stimulus person (i.e. of the eating diaries read
by participants) is a randomly assigned variable. A participant variable is one
that is stable amongst participants, and to which the participants are not
assigned (i.e. if gender of the participants themselves was a variable in this
study, it would be a participant variable)
2. Chaiken and Pliner reported the following mean femininity ratings (higher numbers
indicate greater femininity): male-small meals (2.02), male-large meals (2.05),
female-small meals (3.90), and female-large meals (2.82). Assume there are equal
numbers of participants in each condition.
a) Are there main effects?
Yes, both for gender of the stimulus person and size of the meal
b) Is there an interaction?
d) Describe the results in a brief paragraph.
The main effect of gender of the stimulus person indicates that males were
rated less feminine than females. The main effect of size of meal indicates that
individuals who ate small meals were rated more feminine than individuals
who ate large meals. The interaction suggests that males who ate small meals
were rated slightly less feminine than males who ate large meals. However,
females who ate small meals were rated much more feminine than females
who ate large meals.
4. Assume that you want 15 participants in each condition of your experiment that uses
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