Psych 5741/5751: Data Analysis
University of Colorado @ Boulder
Gary McClelland & Charles Judd
Practice Coding Problems
Factorial Analysis-of-Variance
1. An educational psychologist is interested in the effects of two factors on
achievement. The first factor is gender (male, female). The second factor is
the type of goal structure set up within the classrooms (individualistic,
competitive or cooperative).
2. A clinical psychologist is interested in the effects of number of therapy
sessions (1, 15, or 30) and type of therapy (Gestalt, psychoanalytic, Rogerian, or
behavior modification) on clients' satisfaction with therapy.
3. An exercise physiologist is interested in the effect of weight training on
muscle development in women. Subjects are assigned to one of the four
cells formed by the training variable (training or no training) crossed with an
age variable (under 30 vs. over 30 years old).
4. A drug manufacturer is interested in the efficacy of a new product. The
company is experimenting with three dosage levels (1 mg, 2 mg, and 3 mg)
and three means of ingestion (capsules, tablets, and a liquid). The levels of
these two factors are crossed experimentally and their effectiveness assessed.
5. A statistics professor is interested in the effects of three forms of
examinations (difficult items first, difficult items last, difficult items
randomly scattered) and major (psych vs non-psych) on perfomance on the
final exam.
6. A researcher studied the effects on memory of two anesthetics normally
administered before minor operations. The experimenter read words to the
subjects while they were under the anesthetic. The dependent measure was
the number of words correctly remembered two hours later. The first factor
consisted of drug Y or drug X, the second factor consisted of words with low
emotional impact or words with high emotional impact. The third factor was
whether English was the subject's first language, second language, or only
language. The dependent measure was number of words correctly
remembered.
Prepared to accompany Judd & McClelland (1989)
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