Table 1 Descriptive statistics on contributions, punishments, and normative views.
Average | Return of participant | Mann–Whitney test of difference by return-type | |||
|---|---|---|---|---|---|
Low | High | z-statistic | p-value | ||
Contribution | 13.87 (5.72) | 12.93 (5.67) | 15.74 (5.36) | − 10.78 | < .001 |
Punishment assigned | 0.72 (1.87) | 0.78 (2.03) | 0.58 (1.49) | 1.67 | .09 |
Punishment received | 0.72 (1.87) | 0.61 (1.60) | 0.92 (2.31) | − 2.32 | .02 |
Normative views before game | |||||
On high-return members | 15.76 (4.77) | 15.66 (5.04) | 15.97 (4.20) | − 0.07 | .94 |
On low-return members | 11.92 (4.89) | 11.95 (5.05) | 11.85 (4.60) | 0.47 | .64 |
Normative views after game | |||||
On high-return members | 17.40 (4.10) | 17.75 (3.80) | 16.70 (4.60) | 1.41 | .16 |
On low-return members | 13.08 (4.82) | 12.96 (4.80) | 13.31 (4.88) | − 0.62 | .54 |
