In 1977, researchers assigned a chess problem task to randomly allocated participants in two groups. Two sessions were conducted.
In session one, participants of both groups were asked to complete a questionnaire about the amount of time they played chess during the week, the number of years they played, and the enjoyment they got in playing chess. When the participants completed the questionnaire, they were told that the experimenter would enter the information into the computer and that task would take around ten ...
