Z:gnu-www-ja-frank--82eeaf-For the sample as a whole ther/en

For the sample as a whole there were a total of 267 games, which means a total of 534 choices between cooperation and defection. The choices for economics majors and nonmajors are shown in Figure 6, where we see that the defection rate for economics majors was 60.4 percent, as compared to only 38.8 percent for nonmajors.