Table 1.
Type of trial | Probability of receiving the non-zero amount (%) | Non-zero amount receivable upon choosing the alternative urn | ||||
---|---|---|---|---|---|---|
2.50 € (+11.11%) | 3.00 € (33.33%) | 4.50 € (+100%) | 9.00 € (+300%) | 22.50 € (+900%) | ||
Risk | 10 | 0.25 € | 0.30 € | 0.45 € | 0.90 € | 2.25 € |
Risk | 25 | 0.63 € | 0.75 € | 1.13 € | 2.25 € | 5.63 € |
Risk | 50 | 1.25 € | 1.50 € | 2.25 € | 4.50 € | 11.25 € |
Risk | 75 | 1.88 € | 2.25 € | 3.38 € | 6.75 € | 16.88 € |
Risk | 90 | 2.25 € | 2.70 € | 4.05 € | 8.10 € | 20.25 € |
Control | 100 | 2.50 € | 3.00 € | 4.50 € | – | – |
The cells in columns 3–7 display the expected values of the 33 randomly played task trials. Choices are always made between a safe urn yielding 2.25 € and a risky, ambiguous or control urn. The first five rows (columns 3–7) display the expected values of the 25 risky urns, with expected values equal to the safe choice on the bottom-left to top-right diagonal. The last row (columns 3–7) presents the expected value of the three control urns.