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Interpretation of the p value: A national survey study in academic psychologists from Spain
Laura Badenes-Ribera1, Dolores Frías-Navarro, Héctor Monterde-i-Bort
1Universitat de València.
Background:
Incorrect interpretations of p values affect professionals’ decisions and jeopardize the quality of psychological interventions and the accumulation of valid scientific knowledge. This study analyzes the errors made by Spanish academic psychologists in interpreting p values.
Method:
We surveyed academic psychologists about their interpretations of p values. The sample is composed of 418 academic psychologists from Spanish public universities. The mean number of years working as a university professor is 14.16 (SD = 9.39).
Results:
Our findings suggest that many academic psychologists do not know how to correctly interpret p values. The inverse probability fallacy presents the greatest comprehension problems. Methodology instructors also interpret the significance of the p value erroneously.
Conclusions:
These results highlight the importance of the statistical re-education of professors.
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