In a study of factors that regulate behavior, three kinds of subjects are identified: over controllers, average controllers, and under controllers, with the first group being most inhibited. Each subject is given the routine task of filling a box with buttons and all subjects are told they can stop whenever they wish. Whenever a subject indicates he or she wishes to stop, the experimenter asks, "Don't you really want to continue?" The number of subjects in each group who stop and the number who continue are given in the following table.

Are controller group and continue/stop decision associated?

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Controller Continue Stop Total Over Average Under 918 12 20 14 17 9 Total 20 35 55