Abstract
Two survey items askingfor estimates of probability or frequency of everyday events (A), (B),
and their conjunction,(A and B), were completed by 2719 school students in grades 5 to 11.
Cross-sectional and longitudinal analyses revealed chance expression improved with grade,
but no change in incidence of conjunction errors. Gender differences favouring males occurred
for some grades. Comparisons with responses to other probability items indicated incidence
of conjunction errors is independent of development of basic chance measurement.
Jonathan B. Moritz & Jane M. Watson
THE CONJUNCTION FALLACY AND LONGITUDINAL DEVELOPMENT OF CHANCE EXPRESSION