The mere existence of a scintilla of evidence in support of the [non-moving party's] position will be insufficient.'" United States v. Wilson, 881 F.2d 596, 601 (9th Cir. 1989) (quoting Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 252 (1986)). "The deciding court must view the evidence, including all reasonable inferences, in favor of the non-moving party.