Five experiments involving a total of 268 college students indicate that people are especially likely to overinfer quantity or probability from numerosity when they are asked to make inherently difficult judgments, when they are asked to render judgments while performing a concurrent task, and when they are forced to make rapid judgments. (SLD)

We consider human performance on an optimal stopping problem where people are presented with a list of numbers independently chosen from a uniform distribution. People are told how many numbers are in the list, and how they were chosen. People are then shown the numbers one at a time, and are instructed to choose the maximum, subject to the…

Evaluated effects of time pressure on attributions made and solutions generated in hypothetical social problem situations by aggressive and nonaggressive boys. Found a greater level of arousal in the time pressure condition than the untimed condition across all subjects and greater numbers, more types, and more aggressive solutions. (SD)