In their research on the psychology of eating, Janet Polivy and Peter Herman have found that unrestrained eaters who become disinhibited by life circumstances are likely to indulge in high-calorie binges

The results of the Flanagan and Eccles study on changes in parents' work status and its

effect on their children's transition to junior high demonstrated that a. the transition was more rewarding for those children whose parents had been promoted in their workplace. b. the transition was not affected by the parents' work status. c. the transition was more difficult for those children whose parents were experiencing changes in the workplace. d. girls were affected by changes in parents' work status but boys were not.

All of the following are threats to the internal validity of a study except

a. failure to randomly assign participants. b. assigning participants based on gender. c. varying only the independent variable. d. randomly changing several aspects of the study in addition to the independent variable.