Table 9.

Predictions by receivers: summary statistics

Message type	Obs	Average rate of trusta	Actual rate of cooperationb	T-statc	Rate of accuracyd
Promises	62	.71 (.01)	.58 (.06)	1.97**	.53 (.03)
Money mention = 1	22	.71 (.02)	.32 (.10)	3.81***	.43 (.05)
Us mention = 1	23	.71 (.02)	.35 (.10)	3.55***	.46 (.05)
Word count = Long	38	.72 (.02)	.47 (.08)	2.98***	.52 (.04)
Empty talk	18	.28 (.04)	.33 (.11)	0.41	.62 (.06)*
Money = 0	17	.28 (.04)	.29 (.11)	0.05	.64 (.05)**
Us = 0	17	.27 (.04)	.29 (.11)	0.19	.63 (.06)*
Word count = Short	16	.27 (.04)	.25 (.11)	0.14	.64 (.06)**
	80	.61 (.02)	.53 (.06)	1.44	.56 (.03)*

Standard errors are in the parenthesis

*, **, *** p < 0.10, 0.05 and 0.01, respectively

^aThe average prediction of the percentage of the population that believes the message is honored

^bActual rate of cooperation is defined as the percentage of messages that are followed by a cooperative move from the message sender

^cThe statistics reflect the two-sided t test for the null hypothesis that the Average Prediction and Actual Rate of Cooperation are equal

^dThe asterisk indicates significance of two-tailed tests under the null hypothesis that the rate of success is $A_{random}=.5056$