Understanding of the task.

Logistic regression with a binary dependent variable chose lottery which is equal to 1 if the participant selected the lottery and 0 if the participant selected riskless option of $5. reward is the dollar amount associated with the lottery ($5, $8, $20, $50, or $125); probability is the probability of winning the reward (0.13, 0.25, 0.38, 0.5, or 0.75); ambiguity is the level of ambiguity associated with the lottery (.24, 0.5, or 0.74); male is a dummy variable equal to 1 if the participant is male; wealth is the self-reported wealth level ranging from 1 –very poor to 5 –very rich.