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Statistical Power
Statistical power refers to the probability of correctly rejecting a null hypothesis (a hypothesis of no difference). Failing to reject a false null hypothesis means that the researcher will erroneously conclude that a particular treatment, intervention, or relationship is not important. Statistical power is influenced by three factors: (1) the alpha level (α, or probability value) adopted for the statistical test, (2) the size of the sample, and (3) the effect size (ES; or the magnitude of the observed effect). Before discussing these factors, a few words must be said about Type I and Type II errors in hypothesis testing.
Type I and Type II Errors
Figure 1 shows the interplay of accepting or rejecting a null hypothesis when it is actually true or false. A ...
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- Work Motivation
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- Survivor Syndrome
- Theory of Action
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- Virtual Organizations
- Productive Employee Behavior and Performance
- Careers, Identity, and Work–Life Issues
- A Career in I-O Psychology
- Becoming and Being an I-O Psychologist
- Academic Careers in Industrial and Organizational Psychology
- Careers for Industrial and Organizational Psychologists
- Funding Sources for Industrial and Organizational Psychology Research
- Practice Careers in Industrial and Organizational Psychology: External Consulting Roles
- Practice Careers in Industrial and Organizational Psychology: Internal Roles
- Preparing for Academic Careers in Industrial and Organizational Psychology
- Preparing for Careers in Industrial and Organizational Psychology Practice
- Scientist–Practitioner Model
- Succeeding in Academic Careers in Industrial and Organizational Psychology
- Succeeding in Careers in Industrial and Organizational Psychology Practice
- Tips for Applying to Industrial and Organizational Psychology Graduate School
- Tips for Creating a Consulting Practice
- Tips for Getting an Internship
- Professional Organizations and Journals for I-O Psychologists
- Journal of Applied Psychology
- Personnel Psychology
- Academy of Management
- Alliance for Organizational Psychology
- American Psychological Association, Association for Psychological Science
- European Association of Work and Organizational Psychology
- Human Factors and Ergonomics Society
- Industrial and Organizational Psychology Journals
- International Association of Applied Psychology
- Society for Human Resource Management
- Society for Industrial and Organizational Psychology
- Becoming and Being an I-O Psychologist
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