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. 2015 Dec 14;5:18076. doi: 10.1038/srep18076

Figure 1. Experimental results for all treatments.

Figure 1

(A) Donation levels vary depending on the treatment. In the treatment 1 (DG), the dictators give on average 2.2 ECUs. In the treatments 2 and 3 (AG), the amounts given reach on average 4.2 ECUs. Statistical testing revealed no significant differences for the donations between treatments 2 and 3. In the noisy AG, donations decrease to an average of 3.5 ECUs, which is significantly different from the earlier AG treatments (Welch two sample t-test on average donations per session, t = 3.7491, df = 7.982, p-value = 0.005655). (B) Receivers’ average acceptance rate per session. Even if there is no significant difference between the average acceptance levels of treatment 2 and treatment 4, there is a marginally significant difference in the acceptance levels of treatments 2 and 3 (Welch two-sample t-test on average acceptance per session: t = −2.4509, df = 5.369, p-value = 0.05449). The donation distributions (C) for treatment 1 (DG), (D) for treatment 2 and 3 (AG) and (E) for treatment 4 (noisy AG).