The assessment is primarily based on a single, highly authoritative and relevant source. An official announcement on the SEC.gov website (Authority: 0.95, Relevance: 0.88) directly confirms that SEC Chairman Paul Atkins is scheduled to deliver a speech at the New York Stock Exchange. This source corroborates the key elements of the statement: the individual (Paul Atkins), his title (SEC Chair), and the event (a speech). The remaining five sources, while also from the highly authoritative SEC.gov domain, are completely irrelevant to the subject of an official's public appearance and therefore do not contribute any supporting or conflicting evidence. The high probability of truth is derived from the strength of the single, direct piece of evidence from an official primary source. There is no conflicting information among the provided sources.