Tendency for people to ignore essential comparative (control group) information.
Participants are presented with a 2 × 2 contingency table and are asked to judge the nature and extent of the relationship between the two variables on a 21-point scale ranging from –10 (strong negative association) to +10 (strong positive association).
The score is the correlation between the response of the subject and the true association between the variables (Δp) across the 25 items.
Stanovich, K. E., West, R. F., & Toplak, M. E. (2016). The rationality quotient: Toward a test of rational thinking. Cambridge, MA, USA: MIT Press.