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PSY340: Statistics for the Social Sciences
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Part I: For the following, you may use SPSS or do them by hand (or even both). 1) It has been suggested that pupil size increases during emotional arousal. A researcher would, therefore, like to see whether the increase in pupil size is a function of the type of arousal (pleasant versus aversive). A random sample of five participants is selected for the study. Each participant views all three stimuli: neutral, pleasant, and aversive photgraphs. The neutral photograph portrays a plain brick building. The pleasant photograph consists of a young man and woman sharing a large ice cream cone. Finally, the aversive stimulus is a graphic photograph of an automobile accident. Upon viewing each stimulus, the pupil size is measured (in millimeters) with sophisticated equipment. The data are as follows. Test whether all groups are equal (assume an alpha level of 0.05):
2) Use the same data as above, but treat as if the experimenters used a between
groups design (different groups for each stimulus type).
3) Compare your answers from 1 and 2. Even though the data are exactly the same, you get two different F's. Explain why this is? Which design leads to a statistically more powerful test? 4) A human factors psychologist studied three computer keyboard designs. Three samples of individuals were given material to type on a particular keyboard, and the number of errors committed by each participant was recorded. Are the groups the same? Use both an ANOVA and Tukey post-hoc tests to answer this question. The data are as follows:
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Questions regarding content of this site should be addressed to
Dr. J. Cooper Cutting, jccutti@ilstu.edu.