16. Goodyer and Altham (A-26) compared the number of lifetime exit events occurring over the lives of children between the ages of 7 and 16 years who recently experienced new onset episodes of anxiety and depression (cases) with the incidence among community controls matched by age and social class. An exit event is defined as an event that results in a permanent removal of an individual from a person's social field. Among 100 cases 42 had experienced two or more exit events. The number with two or more exit events among the 100 controls was 25. May we conclude on the basis of these data that the two populations are not homogeneous with respect to exit event experience? Let a = .05.