Respondents in this study were people picnicking along the banks of the Charles River prior to
the July 4th fireworks display. Their ages ranged from 15 to 63, with a mean of 24. Many of the younger
participants were presumably students at a college in the Boston or Cambridge area. Most completed the
survey in small groups of friends or family. Although they were requested not to discuss it until everyone
in their group had completed it, some may have. (This, presumably, would elevate the CRT scores
relative to most of the other studies in which participation was more closely supervised.)