About the Authors

Richard A. Lippa

rlippa@fullerton.edu

Affiliation Department of Psychology, California State University, Fullerton, California, United States of America

Kathleen Preston

Affiliation Department of Psychology, California State University, Fullerton, California, United States of America

John Penner

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.