To investigate the psychological effects of taxi violence, a researcher surveyed people passing through two taxi ranks. The ‘peaceful’ taxi rank had no history of violence, whereas the ‘violent’ taxi...

To investigate the psychological effects of taxi violence, a researcher surveyed people passing through two taxi ranks. The ‘peaceful’ taxi rank had no history of violence, whereas the ‘violent’ taxi rank had a history of violent conflict, including shootings. Half the subjects were taxi passengers and half the subjects were pedestrians passing through the taxi rank. Subjects responded to a seven-item measure of anxiety. The data are reported below. What conclusions can the researcher draw?