Conditionals statements are a common and necessary component in natural languages. The research reported in this paper is on a fundamental question about singular conditionals. Is there an adequate account of people's truth, falsity, and credibility (probability) judgments about these conditionals when their antecedents are false? Two experiments examined people's quantitative credibility ratings and qualitative truth and falsity judgments for singular conditionals, if p then q, given false antecedent, not-p, cases. The results demonstrate that, when relevant knowledge about the conditional probability of q given p, P(q|p), is available to participants in not-p cases, they tend to make credibility ratings based on P(q|p), and to make "true" (or "false") judgments at a high (or low) level of these credibility ratings. These findings favor the Jeffrey table account of these conditionals over the other existing accounts, including that of the de Finetti table.

中文翻译：

---

杰弗里表的证据。

条件语句是自然语言中常见且必要的组成部分。本文报道的研究是关于奇异条件的一个基本问题。如果前提条件错误，人们是否对这些条件的真实性，虚假性和可信性（概率）判断做出充分说明？有两个实验检查了人们对定量条件的定量可信度等级和定性真假判断，如果给定的是假先例而不是p，则p等于q。结果表明，在非p情况下，当参与者可以获得有关q给定p​​的条件概率的相关知识P（q | p）时，他们倾向于基于P（q | p）进行信誉评级，并且在这些信誉等级的高（或低）水平上做出“真”（或“假”）判断。