Project

Some scenarios adapted from Gravetter, F.J. & Wallnau, L.B. (1996). Statistics for the behavioral sciences (4th ed.). St. Paul, MN: West Publishing.

3. Several studies indicate that handedness is related to differences in brain function. Since different parts of the brain are specialized for specific behaviors, this means that left- and right-handed people should show different talents. To test this hypothesis, a psychologist tested pitch performance (part of music ability) for three groups of subjects: left-handed, right-handed, and ambidextrous. The data from that study are as follows:

left-handed right-handed ambidextrous

6 1 2 4 0 0 3 1 0 4 0 2 3 2 1

Use the 0.05 level of significance. The obtained statistic is 5.06. A. Test and why it’s used. B. Concluding paragraph with APA statistical report and explanation. C. Graph D. Questions. 1. What kind of statistical test would be used (be specific) if we did not look at an ambidextrous group? 2. What would you expect to happen to the obtained statistic if only music majors participated in the study? (assume the above involved students of all majors)