About the Authors
- Richard A. Lippa
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* E-mail: rlippa@fullerton.edu
Affiliation Department of Psychology, California State University, Fullerton, California, United States of America
- Kathleen Preston
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Affiliation Department of Psychology, California State University, Fullerton, California, United States of America
- John Penner
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Affiliation Department of Psychology, California State University, Fullerton, California, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: RL. Analyzed the data: RL KP. Wrote the paper: RL. Gathered, collated, and entered data; contacted staff at the U. S. Bureau of Labor Statistics to track down statistical information: JP.